Social conservatives in the Republican party find themselves in a real bind as they prep for 2008. They're pretty sure Senator Clinton will be their opponent, but there is a sense that only candidates whose social conservatism is suspect or absent altogether are in a position to beat her. The genuine social conservatives like Sam Brownback, Tom Tancredo, and Duncan Hunter are scarcely a blip on the voters' radar screen, at least at present.
There are Republicans who doubtless could defeat Hillary - John McCain, Rudy Guiliani, Mitt Romney - but none of these excite conservatives who see each of them as personally or ideologically problematic. One person who does get conservative juices flowing and who might be able to at least give Hillary a run is Newt Gingrich, but he's not a candidate at this point, and he's carrying an awful lot of personal baggage.
Peggy Noonan summed up the Republican plight when she quipped, that of the major Republican contenders - McCain, Guiliani, Gingrich, and Romney - it is ironic that the only one who has only one wife is the Mormon.
My friend Jason linked me to this article which delves into this matter in a little more detail.
RLC