Senate Majority Leader Reid says Mitt Romney went 10 years without paying taxes . Republicans push back against Reid 's unsubstantiated claims , calling him a liar . GOP leaders say they know they 're playing into Reid 's hands by responding but say they must . Reid often pulls no punches when going after an opponent , especially one he dislikes .
Senate Majority Leader Reid says Mitt Romney went 10 years without paying taxes . Republicans push back against Reid 's unsubstantiated claims , calling him a liar . GOP sources say they know they 're playing into Reid 's hands by responding but feel they must . Reid often pulls no punches when going after an opponent , especially one he dislikes .