Old Guard versus New

Chuck Todd frames tonight's AFL-CIO debate as a clash between "the old guard of Washington" -- Clinton, Biden and Dodd -- versus Obama and Edwards.

It's a fascinating dynamic that I think is developing in this primary. But how long can Edwards and Obama be allies and how comfortable will Dodd and Biden be carrying Clinton's water?

Meanwhile, "Richardson is going to be the under-the-radar candidate; it's obvious; he's not getting involved in the bashing of Obama, Edwards and Clinton and that could pay dividends in Iowa."