Senate Majority Leader Harry Reid took his jihad concerning Mitt Romney's personal finances to the chamber floor Thursday, repeating his unsubstantiated claim that the wealthy Republican paid no federal income taxes for 10 years.

Questions about Romney's taxes clearly have the potential to hurt the GOP presidential candidate, with polls indicating that voters would like to see more expansive disclosure of his records.

Romney seems determined to tough out the issue, though. He has refused to release income tax returns from before 2010, and he recently dodged a question about whether the effective rate on his taxes had ever been below the 13.9% rate he paid in 2010.