Former Alaska Gov. Sarah Palin is losing ground with Republicans as some of her possible opponents for the GOP presidential nomination gain ground.

Palin's unfavorable numbers with Republicans are at an all-time high in the new ABC/Washington Post poll released Wednesday, which shows other top Republicans including former Massachusetts Gov. Mitt Romney and former Arkansas Gov. Mike Huckabee with more encouraging numbers.

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Palin has a 58 percent net favorable rating among Republicans, and a 37 percent net unfavorable rating. While that rating is still positive, it's the worst she's had with Republicans since she emerged on the national stage; her previous low was 63-31 percent.

It's the trajectory of Palin's numbers that could keep her out of the race for president. If she keeps losing support with her own base, she might not be able to snag the nomination, let alone beat President Obama in the general election.

Meanwhile, Romney is on the upswing. Sixty percent of Republicans view Romney favorably and 21 percent see him unfavorably, the best rating Romney's had in the ABC/WaPo poll.

Huckabee's numbers are near his all-time high, too. Sixty-one percent of Republicans have a favorable impression of Huckabee, while 18 percent have an unfavorable opinion.

Former House Speaker Newt Gingrich has a 55-26 favorable/unfavorable rating — lower than Palin's, but also the first test in the ABC/WaPo poll of Republicans' opinion of Gingrich since he was last in office in the 1990s.

The poll, conducted March 10 to 13, has a six-point margin of error.