Obama, Kerry, Clinton, Schumer, Durbin; none of them will even comment on Feingold's proposed censure of the president.
However, Kos digs up a list of senators who were willing to censure President Clinton for the Lewinsky affair, a list which includes Kerry, Schumer, and Durbin (as well as Kennedy, Lieberman, and Reid, among many others). This is maybe ever-so-slightly unfair, since in that context a resolution for censure was advocated as an alternative to impeachment, a possible compromise. But if these Democrats want to use that as an excuse, they will have to admit either that President Clinton was deserving of censure but President Bush is not, or that they supported the censure of Clinton even though they didn't actually believe it was warranted. Or I suppose, as a third possibility, they could say that they believe Bush is worthy of censure, but that they still don't support the resolution, but this would be more or less tantamount to admitting that they are cowards.
UPDATE: Via Kevin Drum I discover that the excuse mentioned above actually isn't available; the resolution to censure Clinton was introduced after the impeachment proceedings had concluded.
Chico-towner asks in the comments:
"Bush is at 34%... why aren't they ravaging his political carcass?"
"Because as a group they lack the courage of a lone buzzard."