With Sin City as a backdrop, seven Democratic presidential hopefuls went head-to-head on the issues Thursday night, with the biggest pressure likely on front-runner Sen. Hillary Clinton.She faced the first question about stumbling in the last debate and responded first by joking that her pant suit was "made out of asbestos."Clinton then sparred right away with Sen. Barack Obama - her closest rival - on the issue of health care.The candidates are debating at the Thomas and Mack Center on the campus of the University of Nevada, Las Vegas.The debate, hosted by CNN and the Nevada Democratic Party, is the first showdown between Democrats since Clinton's stumble at a debate in Philadelphia, Pennsylvania.That's where the senator from New York was accused of inconsistency on her answer to a question about driver's licenses for illegal immigrants. Criticism of Clinton's response was discussed in the media for days afterward.Clinton has to do better this time, CNN senior political analyst Bill Schneider said Thursday."She has to reassure Democrats that she speaks from conviction, that she's being honest with the people, that she doesn't talk like a typical politician - which is what she sounded like at the last Democratic debate and took a lot of heat for that," Schneider said.Gloria Borger, CNN's other senior political analyst, agreed: "Clinton's on the hot seat. She has to get rid of the notion that she can't answer a question directly or that as a front-runner she is just playing out the