From NBC's Domenico Montanaro
The Atlantic's Marc Ambinder digs into the Republican in-fighting in Michigan over the primary date and highlights cooperation between the McCain and Giuliani camps.

Currently Michigan's primary is scheduled for Feb. 5th with a big asterisk. The state party and the candidates have endorsed a joint primary of Feb. 5th or earlier -- the "or earlier" is what one Giuliani supporter objects to. For the Giuliani campaign, "it's most convenient, strategy-wise, for Michigan to choose delegates on Feb. 5 or later," Ambinder writes, because "it will dilute the momentum effect provided by Florida," whose primary is on Jan. 29th.

And other delegate selection rules "rankle" the McCain and Giuliani campaigns.