See the full Washington Post-ABC News poll

Hillary Clinton and Barack Obama are still deadlocked in the Democratic race in Iowa with John Edwards in third place, pushing to the forefront the question of who will do the best job of turning out their supporters for the Jan. 3 caucus. Obama leads with 33 percent, followed by Clinton with 29 percent and Edwards with 20 percent. All others are in single digits. The poll was conducted Dec.13-17 and the margin of error is 4 points.