Jonathan Chait explains the facts of life about the political dynamics of one-issue voter groups.

Dear rural/exurban Christian conservative voters: Congratulations on your election victory. By going to the polls in unprecedented numbers Tuesday, you overwhelmed an enormous Democratic turnout and returned President Bush to office, along with a number of very conservative senators. Now Bush is preparing to repay your efforts by moving immediately on your highest priorities: a flat tax and privatizing Social Security.

Oh, wait. You didn't particularly hanker for those things, did you? The election is so far in the past now that it has receded into a hazy memory. But as I recall, you voted for Bush because of his position on one issue — he opposes gay marriage — and on the general principle that he is a godly man who shares your values. Now Bush has decided, conveniently enough, that those values are identical to those of his wealthy financiers.  [...]

Meanwhile, what about opposing gay marriage, the one mandate Bush might legitimately claim? Earlier this year, Bush barely lifted a finger in support of a constitutional amendment banning it. (Compare this to the furious arm-twisting he performs to get moderates to back his tax cuts.) If he has a mandate to do anything, it's to bring up the amendment again. However, he's said nothing about doing so, and nobody expects him to.

No surprise there — it's hardly in the Republican Party's interest. If gay marriage is banned everywhere, what's going to bring all those heartland conservatives to the polls next time?