Sen. Barack Obama "has come from behind to turn the Democratic presidential race in New Hampshire into a toss-up," according to a new Concord Monitor poll. Obama leads with 32%, followed by Sen. Hillary Clinton at 31%, John Edwards at 18% and Gov. Bill Richardson at 8%.

Key finding:

"The poll suggests that the Democratic race could hinge on the turnout of undeclared voters, who aren’t registered with either political party. Much of Obama’s backing comes from undeclared voters, while registered Democrats make up the bulk of Clinton’s support. In New Hampshire, undeclared voters can vote in either party primary, giving them sway in both contests."