Noah Millman counters Chait's idea that Santorum could galvanize socially conservative, economically populist voters in the general election:
The people who are primarily motivated by these issues are probably already ideological voters, and will vote Republican – and show up to vote Republican – regardless. Downscale swing voters I’d expect to be motivated by other matters, even if they were more comfortable with a socially-conservative candidate. A Santorum general election campaign that emphasized the centrality of social issues would seem to a swing voter not so much offensive as off-base.
(Obama vs Santorum poll of polls from RCP)
The Dish 