The survey was conducted between Feb. 22 and Feb. 25, among 1,082 Americans. It has a plus-minus 3 percentage-point margin of error.
The first primaries to decide each party's nominees begin in early next year.
Regarded as a straight-shooter and something of a maverick at times in his party, McCain, 70, set Washington abuzz with a speech to a Republican political action committee in November, just over a week after the elections and on the day he took the first formal steps toward launching a presidential campaign.
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