To be honest, I haven't been closely following the presidential primaries, but one of the GOP candidates is Ron Paul, who I've admired for a long time for being an atypical Republican in Congress, in that he doesn't just toe the Bush, pro-Iraq line and is very (rightfully) critical of U.S. foreign policy.
In the last debate, Rudy Giuliani tried bullying Paul for his contention that "blowback" from U.S. foreign policy was responible for 9/11. He even demanded that Paul retract his answer and tell us that he "didn't really mean it."
Paul's response (thanks to Antiwar.com): “I believe the CIA is correct when it warns us about blowback. We overthrew the Iranian government in 1953 and their taking the hostages was the reaction. This dynamic persists and we ignore it at our risk. They’re not attacking us because we’re rich and free, they’re attacking us because we’re over there.”
Exactly. In that one sentence, Paul told more truth, in a more significant and powerful way, than Kucinich did in '04 (Sorry, Dennis).
Check out the man's website: http://www.ronpaul2008.com/