WASHINGTON -- As senior aides for President Barack Obama and Republican candidate Mitt Romney stepped up their political attacks against each other, the president said he is frustrated that he has failed to change the toxic political atmosphere in Washington."Washington feels as broken as it did four years ago," Obama said in a taped interview on CBS This Morning."And if you asked me what is the one thing that has frustrated me most over the last four years, it's not the hard work. It's not the enormity of the decisions. It's not the pace. It is that I haven't been able to change the atmosphere here in Washington to reflect the decency and common sense of ordinary people -- Democrats, Republicans and independents -- who I think just want to see their leadership solve problems."There's enough blame to go around for that."Yet on other Sunday talk shows his top supporters, along with those for Romney, continued to argue whether the presumptive Republican nominee helped ship jobs offshore when he was a businessman and used lucrative tax loopholes unavailable to most Americans.Ed Gillespie, Romney's campaign adviser, said on Meet the Press that outsourcing continues in the U.S. economy partly because the Obama administration has imposed "excessive regulations" and insisted on a high corporate tax rate.He said the political attacks against Romney's business record are a "distraction" from key issues like improving the economy.