The moderate Republicans.
"Republicans for Kerry? After enduring a sustained offensive from conservatives, Republican moderates are quietly mounting a counterattack against Bush, DeLay & Co."
Regardless of what you think about the source, this is what I've seen in a few folks.
And, going to war, spending the money and lives, without finding WMD is bothering them. Really bothering them, maybe more than some of the issues you cited.
Arf