Read the full Gallup analysis

Barack Obama leads Hillary Clinton by 60 percent to 29 percent among black Democratic voters surveyed Jan. 23-29. However, Clinton led Obama by 57 percent to 29 percent. The margin of error was 6 percent. Gallup said, “The vote of black Democrats promises to be significant in many states — and congressional districts within states — in next Tuesday’s crucial Super Tuesday primaries.” By the same token, the Hispanic vote could mean a big boost for Clinton in states like California, New York, New Mexico and New Jersey.