Two national polls have been conducting nightly surveys since the former North Carolina senator departed the race, and both show his supporters moving more to Obama than Clinton. First, Gallup:
Gallup Poll Daily tracking shows Hillary Clinton and Barack Obama as close as they have been since the polling program started at the beginning of 2008. Forty-four percent of Democratic voters nationwide support Clinton, while 41% support Obama, within the poll's three-point margin of error. The data suggest that Obama has gained slightly more -- at least initially -- from John Edwards' departure from the race. In the final tracking data including Edwards in all three days' interviewing (Jan. 27-29 data), Clinton had 42%, Obama 36%, and Edwards 12%. Since then, Clinton's support has increased two points and Obama's five.
The Rasmussen Reports daily Presidential Tracking Poll for Friday shows Barack Obama inching closer to Hillary Clinton. It’s now Clinton 43%, Obama 37%. A week ago, Clinton had an eleven point advantage, 41% to 30%. The last two nights of tracking were the first without John Edwards in the race. For those two nights, it’s Clinton 44% and Obama 42% meaning that Clinton’s support is essentially unchanged. This suggests that many former Edwards supporters now support Obama, many others have yet to make a decision, and few currently support Clinton.