Polls: Clinton Leads in Iowa, McCain Leads National Tracking Poll

John McCain leads a tracking poll for the first time this year. [Rasmussen]

Hillary Clinton leads a tie between Barack Obama and John Edwards in Iowa, with 30 percent to their 26 percent. [Reuters/C-SPAN/Zogby]

Clinton falls in New Hampshire, while Edwards surges and Obama gains. [American Research Group]

And the anticipated Des Moines Register Iowa poll comes out tonight. [Ambinder]