"Today, John McCain put the former mayor of a town of 9,000 with zero foreign policy experience a heartbeat away from the presidency," Obama spokesman Bill Burton said in a statement.

Burton also criticized Palin as a vice presidential pick for her support of oil drilling in the Alaskan wilderness and her anti-abortion stance, referring to the 1973 Supreme Court decision that made abortion legal in the United States.

"Governor Palin shares John McCain's commitment to overturning Roe v. Wade, the agenda of Big Oil and continuing George Bush's failed economic policies. That's not the change we need, it's just more of the same," he said.

The choice of Palin was seen as a bold effort by McCain to attract disgruntled Democratic and independent supporters of Senator Hillary Clinton, who was defeated by Obama in the race to be the Democratic Party's presidential nominee.

Palin, a telegenic conservative, has led the oil-producing northwestern US state since December 2006 and was the first woman and youngest person to hold that state's top job.

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