Democratic presidential hopefuls, from left, Sen. Joseph Biden, D-Del., New Mexico Gov. Bill Richardson, Rep. Dennis Kucinich, D-Ohio, Sen. Hillary Rodham Clinton, D-N.Y., Sen. Barack Obama, D-Ill., Sen. Christopher Dodd, D-Conn. and former Sen. John Edwards, D-N.C. 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)