Alaska Gov. Sarah Palin is introduced by presumptive Republican presidential nominee John McCain at a campaign rally August 29, 2008 in Dayton, Ohio. McCain announced Palin as his vice presidential running mate at the rally. (Photo by Mario Tama/Getty Images)

Chuck Heath, right, and his wife Sally watch, in their home in Wasilla, Alaska, as their daughter, Alaska Gov. Sarah Palin. was chosen by Sen. John McCain as his running mate and choice for vice president. (AP Photo/Al Grillo)

Alaska Gov. Sarah Palin, center, arms a simulated roadside bomb on the IED defeat course at the training village on Camp Beuhring, Kuwait, on July 24, 2007. (AP Photo/Department of Defense, Sgt. Jacob A. McDonald)

In this Feb. 11, 2007 file photo, Todd Palin, center, drives his wife, Alaska's Gov. Sarah Palin, to the staring line of the Iron Dog snowmobile race before he starts the race in Big Lake, Alaska. (AP Photo/Al Grillo, File)

(L-R) Presumptive Republican presidential nominee John McCain, wife Cindy, Alaska Gov. Sarah Palin, daughter Piper and husand Todd wave to the crowd in Dayton, Ohio. (Photo by Mario Tama/Getty Images)

Supporters cheer at a rally for presumptive Republican presidential nominee John McCain in Dayton, Ohio. (Photo by Mario Tama/Getty Images)

Presumptive Republican presidential nominee John McCain stands with Alaska Gov. Sarah Palin onstage at a campaign rally in Dayton, Ohio. McCain announced Palin as his vice presidential running mate at the rally. (Photo by Mario Tama/Getty Images)

Jim Palin, father of Todd Palin, displays a photo of Alaska Gov. Sarah Palin's beauty queen competition photo, black and white, a 1991 photo of Sarah and her husband Todd, center, and a prom photo of Sarah and Todd, back, at his house in Wasilla, Alaska. (AP Photo/ Al Grillo)

Alaska Governor Sarah Palin's husband Todd (L-R), daughters Piper, Willow, Bristol and son Trig listen as Palin is introduced as Republican vice presidential running mate by presidential candidate John McCain at a campaign event in Dayton, Ohio. (UPI Photo/John Sommers II)

In this Nov. 6, 2006 file photo, Republican gubernatorial candidate Sarah Palin, and her daughter Piper, 5, waive campaign signs in Anchorage, Alaska. (AP Photo/Al Grillo, File)

Alaska Gov Sarah Palin greets the crowd minutes after Republican presidential nominee John McCain introduced Palin as his Vice Presidential running mate. (AP Photo/Mary Altaffer)

Former New Jersey Gov. Brendan Byrne, left, chats with Alaska Gov. Sarah Palin during a break at the National Governors Association centennial meeting, Saturday, July, 12, 2008, in Philadelphia. (AP Photo/Tom Mihalek)

In this Dec. 4, 2006 file photo, Todd Palin, right, holds the Bible for his wife, Sarah Palin, as she is sworn in as Alaska's governor during an inauguration ceremony in Fairbanks, Alaska. (AP Photo/Al Grillo)

In this Dec. 4, 2006 file photo, Gov. Sarah Palin (left), her husband Todd, and daughters Bristol, 16, and Piper, 5, front stand as the colors are retired at the end of an inauguration ceremony in Fairbanks, Alaska. (Associated Press)

Alaska Gov. Sarah Palin signs an autograph, as daughter Piper watches, at a campaign rally for Republican presidential nominee John McCain where she was named his Vice Presidential running mate. (Photo by Mario Tama/Getty Images)

In this Monday, June 30, 2008 file photo, Laurie Serino, left, talks about the high food prices with Alaska Gov. Sarah Palin in Barrow, Alaska. (AP Photo/Al Grillo, file)

Alaska Gov. Sarah Palin addresses supporters at a campaign rally in Dayton, Ohio after she was introduced by presumptive Republican presidential nominee Sen. John McCain as his Vice Presidential running mate. (AP Photo/Stephan Savoia)

John McCain, U.S. senator from Arizona and Republican presidential candidate, left, and Sarah Palin, governor of Alaska, shake hands at a campaign rally in Dayton, Ohio. (Photo by Jay LaPrete/Bloomberg News)

Alaska Gov. Sarah Palin stands onstage at a campaign rally for presumptive Republican presidential nominee John McCain . (Photo by Mario Tama/Getty Images)

Republican presidential candidate, Sen. John McCain, R-Ariz., and Alaska Gov Sarah Palin appear together onstage during the 'Road to the Convention Rally' at the Erwin J. Nutter Center in Dayton, Ohio. McCain introduced Palin as his Vice Presidential running mate at the event. (AP Photo/Mary Altaffer)