The experience argument over Barack Obama is starting to bite at just the moment when voters are realizing that he might actually become president.

Will the Clintons decide to go negative? Will they insist on seating Florida and Michigan at the convention? Either one or both of those and they put democratic unity in peril.

Identity politics. It's everywhere. Not just gender and race among Democrats. Even steroids and HDH in baseball? You betcha. The Democrats lit into Clemens and the Republicans went after McNamee.

So here's the situation as we head for the March 4 primaries: the Clintons and McCain running against Obama together, on the same theme.

After that cheap and prepared remark about Obama Xeroxing words, which made her visibly uncomfortable even as she delivered it, Hillary came through big time.

This raging nun role she has decided to play for the last lap is not just not working -- it is turning into an ironic climax out of Greek tragedy.