All eight candidates attended the forum at Dartmouth College. The leading Democratic presidential hopefuls conceded Wednesday night they cannot guarantee to withdraw all U.S. combat troops from Iraq by 2013, the end of the next president's first term.With the primary season approaching, all eight have vied with increasing intensity for the support of anti-war voters likely to provide money and organizing muscle as the campaign progresses.Focus on health care, Foreign policy blended with domestic issues at the two-hour debate, the drive for universal health care most prominently. "I intend to be the health care president," said Clinton, adding she can now succeed at an undertaking that defeated her in 1993 when she was first lady. But Biden said that unnamed special interests were no more willing to work with Clinton than they were more than a decade ago. Edwards said his position on Iraq was different from Obama and Clinton, adding he would "immediately drawn down 40,000 to 50,000 troops." That's roughly half the 100,000 that Gen. David Petraeus, the top U.S. commander in Iraq, has indicated could be stationed there when President Bush's term ends in January 2009. Edwards sought to draw a distinction between his position and that of Clinton, saying she had said recently she wants to continue combat missions in Iraq.