Gallup: Key Clinton voters are shifting to Obama

Following up on yesterday's news that Barack Obama had jumped to a 16-percentage-point lead over Hillary Rodham Clinton in its national "tracking poll" on the Democratic nomination battle, Gallup writes today that "support for Clinton among some of her traditionally stalwart support groups -- women, Easterners, whites, adults with no college education, and Hispanics -- has fallen below 50%."

According to Gallup, "the only major demographic group still supporting Clinton to the tune of 51% or more is women aged 50 and older."

Meanwhile, Obama is tied or ahead of Clinton in Gallup's polling of "non-Hispanic whites," all women, voters with high school degrees "or less" and Hispanics:

"At least for now," Gallup concludes, Obama "has expanded his position as the preferred candidate of men, young adults, and highly educated Democrats, and has erased Clinton's advantages with most of her prior core constituency groups, including women, the less well-educated, and whites."

Update at 3 p.m. ET: In today's Gallup tracking poll, Obama leads Clinton by 14 percentage points -- 54%-40%.

Original here