According to Intrade, the top ten contenders are as follows.
1.) Rob Portman (Who?!?) - Senator from Ohio - 23.9%
2.) Tim Pawlenty - Ex-Governor of Minnesota - 20.0%
3.) Marco Rubio - Senator from Florida - 10%
4.) Paul Ryan - Congressman from Wisconsin - 7.5%
5.) John Thune - Senator from South Dakota - 6.8%
6.) Bobby Jindal - Governor of Lousiana - 6.2%
7.) Chris Christie - Governor of New Jersey - 4.5%
8.) Condoleezza Rice - Former Secretary of State for GWB - 2.5%
9.) Bob McDonnell - Governor of Virginia - 2.2%
10.) Rand Paul - Senator from Kentucky - 2.1%