That’s the Dems line, as it pretty much has to be. But is it true? The other day Volokh linked to some data from political scientist Keith Poole mapping the ideological leanings of Bush, McCain, Obama, and Clinton, based on their congressional votes and, in the case of Bush, the Presidential Support roll calls.
Based on the data, Clinton and Obama are essentially ideologically identical, just left of the centre in their party. In contrast, their is a major gap between Bush and McCain: McCain is on the left wing of his party, while Bush is out on the right, within hollerin distance of the lunatic fringe.