Heres a look at the candidates running in contested races in the Democratic and Republican primaries on March 4. Click on the race to find out more about them, in their own words.U.S. Senate - Republicans: John Cornyn (i), Ken Cope, Chris Mapp, Curt Cleaver, Reid Reasor, Steve Stockman, Dwayne Stovall, Linda Vega. Democrats: David M. Alameel, Harry Kim, Keesha Rogers, Maxey Marie Scherr, Michael Fjet Fjetland. U.S. House - District 6 - Republicans: Joe Barton (i), Frank C. Kuchar; District 25 - Democrats: Stuart Gourd, Marco Montoya; District 26 - Republicans: Michael Burgess (i), Joel A. Krause, Divenchy Watrous; District 3 - Democrats: Marc Veasey (i), Tom Sanchez. Texas statewide races - Governor - Republicans: Greg Abbott, Lisa Fritsch, SECEDE Kilgore, Miriam Martinez. Democrats: Wendy R. Davis, Reynaldo Ray Madrigal. Lieutenant governor - Republicans: David Dewhurst (i), Dan Patrick, Jerry Patterson, Todd Staples. Attorney general - Republicans: Dan Branch, Ken Paxton, Barry Smitherman. Comptroller of Public Accounts - Republicans: Glenn Hegar, Harvey Hilderbran, Debra Medina, Raul Torres. Land commissioner - Republicans: George P. Bush, David Watts. Agriculture Commissioner - Republicans: J. Allen Carnes, Joe Cotten, Tommy Merritt, Sid Miller, Eric Opiela. Democrats: Richard Kinky Friedman, Hugh Asa Fitzsimons III, Jim Hogan. Railroad Commissioner - Republicans: Becky Berger, Malachi Boyuls, Wayne Christian, Ryan Sitton. Democrats: Steve Brown, Dale Henry. Supreme Court Chief Justice - Republicans: Nathan Hecht (i), Robert Talton. Supreme Court Justice, Place 6 - Republicans: Jeff Brown (i), Joe Pool. Supreme Court Justice, Place 8 - Republicans: Phil Johnson (i), Sharon McCally. Court of Criminal Appeals Justice, Place 3 - Republicans: Bert Richardson, Barbara Walther. Court of Criminal Appeals Justice, Place 4 - Republicans: Richard Dean Davis, Jani Jo Wood, Kevin Patrick Yeary. Court of Criminal Appeals Justice, Place 9 - Republicans: David Newell, W.C. Bud Kirkendall, State Board of Education - District 11 - Republicans: Patricia Pat Hardy (i), Lady Theresa Thombs, Eric Mahroum. District 13 - Democrats: Erika Beltran, Andrea Hilburn, A. Denise Russell. Texas legislative races, Tarrant County - State senator District 10 - Republicans: Konni Burton, Tony Pompa, Jon Schweitzer, Mark Shelton, Mark Skinner. Democrats: Mike Martinez, Libby Willis. State representative, District 90 - Democrats: Lon Burnam (i), Ramon Romero Jr. State representative, District 92 - Republicans: Jonathan Stickland (i), Andy Cargile. State representative, District 94 - Republicans: Diane Patrick (i), Tony Tinderholt. Tarrant County races - District attorney - Republicans: Kathy A. Lowthorp, George Mackey, Sharen Wilson. 231st District Court - Republicans: Jesse Nevarez (i), John Clark. 297th District Court - Republicans: David Hagerman, Lex Johnston, Jay Lapham, Glynis Adams McGinty. 432nd Distrit Court - Republicans: Ruben Gonzalez (i), Steve Gebhardt. County Criminal Court No. 1 - Republicans: David Cook, Don Hase, Everett Young. County Criminal Court No. 2 - Republicans: Atticus Gill, Joyce Stevens, Carey Walker, John White. County Criminal Court No. 3 - Republicans: Casey Cole, Alexander Kim, Bob McCoy. County Criminal Court No. 8 - Republicans: Charles L. Chuck Vanover, Lynda Tarwater, James R. Wilson. Tarrant County commissioner, Precinct 2 - Republicans: Andy Nguyen (i), H. Suzanne Kelley. Justice of the peace, Precinct 2 - Republicans: Mary Tom Cravens Curnutt (i), Barbara Nash, William Shane Nolen. Justice of the peace, Precinct 3 - Republicans: Russ Casey (i), Christina Fox, Lenny Lopez. Justice of the peace, Precinct 4 - Republicans: Jacquelyn Wright (i), Vickie L. Phillips. Justice of the peace, Precinct 5 - Democrats: Sergio L. De Leon (i), Macario Mac Belmontes. Justice of the peace, Preinct 7 - Republicans: Matt Hayes (i), Tom Corbin,Referendums Democratic Party nonbinding referendums: Urging Congress to pass immigration reform and raise the federal minimum wage, and encourage state lawmakers to accept federal funds to expand Medicaid and pass nondiscrimination legislation. Republican Party nonbinding referendums: Texans should be free to express religious freedoms, including prayer in public places; Texans should expand Second Amendment rights by approving more locations for concealed-handgun license holders to carry their weapons; Texans should abolish the state franchise tax; Texans who receive public assistance should be subject to random drug tests; all elected officials and their staffs should be subject to the same rules and laws as other Texans; and the Affordable Care Act, also known as Obamacare, should be repealed.Voter ID requirementsThis March 4 primary will be the biggest election since the states voter ID law, which requires voters to show government-issued photo identification at the polls, went into effect last year. Acceptable IDs include a drivers license, a state-issued personal ID card, concealed handgun license, military card and citizenship certificate with photo or a passport. Any license thats expired must not be expired for more than 60 days.Anyone who needs one may get a free election identification certificate at a drivers license office.Anyone who shows up at the polls to vote without a photo ID will be given a chance to go home and bring the ID back.If they dont, they may cast a provisional ballot. But to make sure that vote is counted, theyll have to take a valid photo ID to the elections office within six days of the election. Otherwise the ballot will not be counted.Key election dates Feb. 18-28: Early voting for primary election Feb. 21: Last day the elections department may accept an application for a ballot by mail March 4: Primary election April 10: Last day to register to vote for May 10 local election April 28-May 6: Early voting for local election May 10: Local election May 19-23: Early voting for primary runoff election May 27: Primary runoff election Oct. 6: Last day to register to vote in the November general election Oct. 20-31: Early voting for November general election Nov. 4: General electionMore election informationTo contact the Tarrant County elections office, call 817-831-8683 or go to their website.To contact the secretary of states office, call 1-800-252-8683 (VOTE) or 512-463-5650, or go to their website. Sample ballots and a list of Election Day polling sites are online.To check to see if you are registered to vote, go online to VOTEXAS.org or call the Tarrant County elections office at 817-831-8683.Early votingEarly voting for the March 4 general election runs through Feb. 28; 8 a.m.-5 p.m. Tuesday through Friday; 7 a.m.-7 p.m. Saturday; 11 a.m.-4 p.m. Sunday; 7 a.m.-7 p.m. Feb. 24-28.Locations• Tarrant County Elections Center, 2700 Premier St., Fort Worth. This is the main early voting site. Emergency and limited ballots are available there.• All Saints Catholic Church Parish Hall, 200 NW 20th St., Fort Worth• Arlington Subcourthouse, 700 E. Abram St.• Asia Times Square, 2615 W. Pioneer Parkway, Grand Prairie• Bedford Public Library, 2424 Forest Ridge Drive• Benbrook Community Center, 228 San Angelo Ave.• B.J. Clark Annex, Room 4, 603 Southeast Parkway, Azle• Bob Duncan Center, 2800 S. Center St., Arlington• Center for Community Service, Junior League of Arlington, 4002 W. Pioneer Parkway, Arlington• Colleyville City Hall, 100 Main St.• Crowley Community Center, 900 E. Glendale St.• Dan Echols Center, 6801 Glenview Drive, North Richland Hills• Diamond Hill/Jarvis Branch Library, 1300 NE 35th St., Fort Worth• Eagle Mountain-Saginaw school district Administration Building 6, Training Room, 1200 Old Decatur Road, Saginaw• Euless Public Library, 201 N. Ector Drive• Elzie Odom Athletic Center, 1601 NE Green Oaks Blvd., Arlington• Forest Hill Civic and Convention Center, 6901 Wichita St.• Grapevine Community Activities Center, 1175 Municipal Way• Griffin Subcourthouse, 3212 Miller Ave., Fort Worth• Haltom City Northeast Center, 3201 Friendly Lane• Handley/Meadowbrook Community Center, 6201 Beaty St., Fort Worth• Hurst Recreation Center, 700 Mary Drive• James Avenue Service Center, 5001 James Ave., Fort Worth• JPS Health Center Viola M. Pitts/Como, lower level, Suite 100, 4701 Bryant Irvin Road N., Fort Worth• Lake Park Operations Center, 5610 Lake Ridge Parkway, Grand Prairie• Keller Town Hall, 1100 Bear Creek Parkway• Kennedale Community Center, 316 W. Third St.• Mansfield Subcourthouse, 1100 E. Broad St.• North Richland Hills Public Library, 9015 Grand Ave.• Sheriffs North Patrol Division, 6651 Lake Worth Blvd., Lake Worth• Southlake Town Hall, 1400 Main St.• South Service Center, 1100 SW Green Oaks Blvd., Arlington• Southside Community Center, 959 E. Rosedale St., Fort Worth• Southwest Community Center, 6300 Welch Ave., Fort Worth• Southwest Subcourthouse, 6551 Granbury Road, Fort Worth• Summerglen Branch Library, 4205 Basswood Blvd., Fort Worth• Tarrant County Plaza Building, 201 Burnett St., Fort Worth• Villages of Woodland Springs Amenity Center, 12209 Timberland Blvd., Fort Worth• White Settlement Public Library, 8215 White Settlement Road• Worth Heights Community Center, 3551 New York Ave., Fort WorthTemporary voting sites 8 a.m.-5 p.m. Feb. 18-20. Southwestern Baptist Theological Seminary, Naylor Student Center, 1900 W. Boyce Ave., Fort Worth; UNT Health Science Center, Carl E. Everett Education and Administration Building, 3500 Camp Bowie Blvd., Fort Worth 7 a.m.-7 p.m. Feb. 25-27. Tarrant County College Northeast Campus, Student Center NSTU 1506, 828 W. Harwood Road, Hurst; Tarrant County College Northwest Campus, WSTU 1305, 4801 Marine Creek Parkway, Fort Worth; Tarrant County College South Campus, Student Center Room SSTU 1112, 5301 Campus Drive, Fort Worth; Tarrant County College Southeast Campus, ESED-Library Room 1211, 2100 Southeast Parkway, Arlington. 7 a.m.-7 p.m. Feb. 24-27. University of Texas at Arlington, Maverick Activities Center, 500 W. Nedderman Drive, Arlington; Texas Christian University, Brown-Lupton University Union, 2901 Stadium Dr., Fort Worth.