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The candidates' records don't always back up their debate rhetoric.
More Americans view current policies favorably, but gasoline is a worry.
The overhaul would be paid for by ending some business tax breaks.
In an interview, he does not rule out another presidential bid.
His support is almost equal to that of the next three candidates combined.
He spent more than $3 million and took in less than $400,000 in the last three weeks of his presidential bid.