Yes, Reid's a bit icky. But, frankly, Romney encourages this with his secrecy. He could clear all this up by releasing his returns. Until then, we all get to speculate about what could be so terrible in them.
Come on. Reid has the distance from the Obama White House / campaign to hold Romney's feet to the fire – even via a wild-ass claim (and possibly, a lie). The tax return issue seems to have lost some momentum, so lobbing a grenade into the room will bring it nicely back to the fore. Is this a coordinated effort on some level? Would it be at all shocking if it was? Romney clearly has something he's hiding, and there are those rightly determined to flush it out into the light. In this case, the end justifies the means.