Washington, D.C. ? Barack Obama has lost ground among some of his strongest bases of support, including young people, women, Democrats and independents, according to a new ATV/Zogby poll.

The Illinois Democrat has also lost some support among African-Americans and Hispanics, where his lead over Republican John McCain has shrunk, and among Catholics, where he’s lost his lead.

The net result, pollster John Zogby found, is a race that’s neck and neck, with McCain supported by 42 percent; Obama by 41 percent; Libertarian Bob Barr by 2 percent; and independent Ralph Nader by 2 percent. Another 13 percent supported other candidates or were undecided.

Zogby called the results a “notable turnaround” from a July survey he did that showed Obama leading by 46-36.

“McCain made significant gains at Obama’s expense among some of what had been Obama’s strongest demographic groups,” Zogby said.