McCain offered his mea culpa shortly after sitting down onstage and being playfully asked by Letterman, "Can you stay?"
After a difficult week that sparked Democratic worries, Barack Obama fired back at Republican presidential rival John McCain on Friday with tough ads and a retooled message outlining their differences on taxes.
A federal judge fined a leader of the movement challenging President Barack Obama's citizenship and warned her against using the legal system to pursue "political rhetoric and insults."
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GOP says Dems put agenda ahead of country
GOP says Dems put agenda ahead of country
GOP says Dems put agenda ahead of country
GOP says Dems put agenda ahead of country
GOP says Dems put agenda ahead of country
GOP says Dems put agenda ahead of country
GOP says Dems put agenda ahead of country
GOP says Dems put agenda ahead of country
Judge sanctions 'birther' attorney
Judge sanctions 'birther' attorney