A Republican delegate holds up a sign supporting George W. Bush and Dick Cheney as balloons fall during the Republican National Convention August 3, 2000 in Philadelphia. (Photo by Chris Hondros/Newsmakers)

Confetti Flies Everywhere As Laura Bush, Wife Of Texas Gov. George W. Bush, Addresses An Evening Session Of The Republican National Convention In Philadelphia July 31, 2000.

Republican presidential nominee George W. Bush and his wife Laura smile as balloons fall at the Republican National Convention August 3, 2000 in Philadelphia. (Photo by Mark Wilson/Newsmakers)

Vice presidential candidate Dick Cheney speaks to the delegates at the Republican National Convention, August 2, 2000 in Philadelphia. (Photo by Mark Wilson/Newsmakers)

Republican presidential candidate Texas Gov. George W. Bush looks out over the crowd of delegates during his acceptance speech at the Republican National Convention Aug. 3, 2000 in Philadelphia. (Photo by Mark Wilson/Newsmakers)

Republican presidential nominee George W. Bush gives his acceptance speech at the Republican National Convention August 3, 2000 in Philadelphia. (Photo by Mark Wilson/Newsmakers)

Pedestrians walk by a poster of the Statue of Liberty announcing the Republican convention at Madison Square Garden August 23. 2004 in New York City.

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California Governor Arnold Schwarzenegger speaks on night two of the Republican National Convention August 31, 2004 at Madison Square Garden in New York City.

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Sen. Zell Miller (D-GA) speaks on night three of the Republican National Convention, September 1, 2004 at Madison Square Garden in New York City.

Delegates stand on the floor during the 2004 Republican National Convention August 30, 2004 at Madison Square Garden in New York City.

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U.S. President George W. Bush speaks on the final night of the Republican National Convention September 2, 2004 at Madison Square Garden in New York City.

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Track Palin, Bristol Palin, her boyfriend Levi Johnston, Willow Palin, Piper Palin, husband Todd Palin and Republican U.S vice-presidential nominee Alaska Gov. Sarah Palin holding Trig Palin stand on stage.

Former Massachusetts Republican Gov. Mitt Romney speaks on day three of the Republican National Convention on September 3, 2008 in St. Paul, Minnesota

Presumptive Republican U.S presidential nominee U.S. Sen. John McCain and U.S vice-presidential nominee Alaska Gov. Sarah Palin stand on stage on day three of the Republican National Convention (RNC) at the Xcel Energy Center on September 3, 2008

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John McCain accepts the GOP nomination for president at the 2008 Republican National Convention.

U.S vice-presidential nominee Alaska Gov. Sarah Palin greets people at the end of day four of the 2008 Republican National Convention

John McCain and Sarah Palin on stage at the 2008 Republican National Convention.