Democratic presidential hopefuls, from left, New Mexico Gov. Bill Richardson, Rep. Dennis Kucinich, D-Ohio, Sen. Hillary Rodham Clinton, D-N.Y., and Sen. Barack Obama, D-Ill are shown at the start of the Democratic debate at the Cox Pavilion at the University of Nevada, Las Vegas Thursday, Nov. 15, 2007 in Las Vegas. (AP Photo/ Ronda Churchill)