The folks at CQ Weekly have compiled all of the data from the second session of the 109th Congress and have come up with vote rankings for every member of Congress. The first, the Presidential Support Score, measures the percentage of roll call votes in which a given member of Congress supported the publicly-held position of the White House. In the Senate, in particular, this number is relatively high because of the unlikelihood that a vote will be held when there are not 60 Senators already lined up to invoke cloture (thus the difference in scores between Dennis Kucinich, in the House, and the other contenders, potential contenders and former contenders in the Senate). The second, the party unity score, measures the percentage of the time that a given member of Congress votes with the majority of his own party on a roll call vote in which the majority of the other party votes the other way. For reference, I have included both declared and non-declared candidates, as well as one-time candidates and once potential candidates who have since either bowed out or about whom it is assumed they will not run.

Democrats

Candidate	Presidential Support Score	Party Unity Score
Bayh	58	89
Biden	55	91
Clinton	50	93
Dodd	49	95
Kerry	51	95
Kucinich	13*	97
Obama	49	96

Republicans

Candidate	Presidential Support Score	Party Unity Score
Allen	91	96
Brownback	92	83
Frist	93	94
Hagel	96	84
Hunter	92	94
McCain	89	76
Santorum	86	92

Later on this evening I'll compile the data for all of the Senators up for reelection in 2008.