Anderson Cooper recently asked John McCain to comment on the accusation that Romney had paid no taxes:
What you did NOT hear McCain say is that he has seen Romney's returns, 23 years of them, so he knows Reid is wrong. Instead of taking that chance to give the obvious answer, he chose to call Reid "erratic," perhaps in retribution for Reid saying the same about McCain in 2008. If Reid is wrong, McCain's first thought should have been to smack down the lie.