New Hampshire ? The leading Democratic presidential candidates clashed Sunday over each other’s claim to be the true candidate of change in the final hours of the slushy New Hampshire homestretch. Hillary Clinton told voters they should elect “a doer, not a talker.” Barack Obama countered that his rivals are stuck in the politics of the past.

The rhetoric reflected the potentially pivotal nature of Tuesday’s primary. Obama, the freshman Illinois senator, is hoping to sustain momentum from his caucus victory in Iowa, and Clinton is looking to recover from her stinging third-place finish.

A new USA Today-Gallup poll showed Obama opening up a lead at 41 percent, Clinton 28 percent, and John Edwards 19 percent. The New Hampshire poll was taken Friday through Sunday.