Some say it's merely the typical Republican homo-phobe thing: Craig should resign because the sex he tried to solicit was gay sex and Vitter is a real man just sowing his oats.
But Scott Lemieux thinks there's a tawdry underlying Rovian aspect to the whole thing:
Louisiana's governor is a Democrat, and Idaho's is a Republican. Craig resigning would mean a Republican [would be appointed to Craig's seat] going into the 2008 election; Vitter resigning would mean another Democratic Senator. So no conservative pundit should get credit for standing on principle for demanding that Craig resign, and that goes triple if they haven't made the same call for Vitter (who actually violated the law, although he did so in a more heterosexual way that will help to earn forgiveness from conservatives.)So much for the party of family values and rule of law, eh?