Republican presidential candidate Sen. John McCain, left, attends the New York Yankees vs. Oakland Athletics baseball game at Yankee Stadium with former New York Mayor Rudy Giuliani in New York on Sunday July 20, 2008. (AP Photo/Corey Sipkin, Pool)

In this Jan. 5, 2008, file photo Democratic presidential hopeful Hilary Rodham clinton shakes hands with Republican presidential hopeful Rudy Giuliani, as other Democratic and Republican presidential hopefuls mix on stage during a break in the televised presidential debate at Saint Anselm College in Manchester, N.H. When Clinton and Giuliani started campaigning in 2007, they were the clear frontrunners of their respective parties with big names, big money, and big leads over their rivals. Other in the photo from left, former Massachusetts Gov. Mitt Romney, Sen. Clinton, D-N.Y., former Sen. Fred Thompson, R-Tenn., former New York City Mayor Giuliani, former Arkansas Gov. Mike Huckabee, former New Mexico Gov. Bill Richardson, Sen. Barack Obama, D-Ill., and Sen. John McCain, R-Ariz. (AP Photo/Steven Senne, file)

Fomer New York City Mayor Rudy Giuliani , left, shakes hands with Republican presidential hopeful, Sen. John McCain, R-Ariz, during a campaign rally in Hamilton, N.J., Monday Feb. 4, 2008. (AP Photo/Mel Evans)

Former New York City Mayor Rudy Giuliani, left, shakes hands with Sen. John McCain, R-Ariz. announcing that he is leaving the presidential race and endorsing McCain, during a news conference before the Republican presidential debate in Simi Valley, Wednesday, Jan. 30, 2008. (AP Photo/Mark J. Terrill)

Republican presidential hopeful, former New York City Mayor Rudy Giuliani, talks to supporters after conceding the Florida Republican primary at his election watch headquarters in Orlando, Fla., Tuesday, Jan. 29, 2008. (AP Photo/Gerald Herbert)

Former New York City Mayor Rudy Giuliani, left, announces he is bowing out of the presidential race and endorsing Republican hopeful Sen. John McCain, R-Ariz., during a news conference before the Republican presidential debate in Simi Valley, Calif., Wednesday, Jan. 30, 2008. (AP Photo/Mark Terrill)

Republican presidential hopeful, former New York City Mayor Rudy Giuliani, talks to supporters after conceding the Florida Republican primary at his election watch headquarters in Orlando, Fla., Tuesday, Jan. 29, 2008. (AP Photo/Gerald Herbert)

Republican presidential hopeful, former New York City Mayor Rudy Giuliani, talks to supporters after conceding the Florida Republican primary at his election watch headquarters in Orlando, Fla., Tuesday, Jan. 29, 2008. (AP Photo/Gerald Herbert)

Republican presidential hopeful, former New York City Mayor Rudy Giuliani, talks to supporters after conceding the Florida Republican primary at his election watch headquarters in Orlando, Fla., Tuesday, Jan. 29, 2008. Behind him is his wife Judith. (AP Photo/Gerald Herbert)

Posters and discarded drinks sit on a table after Republican presidential hopeful, former New York City Mayor Rudy Giuliani, talked to supporters after conceding the Florida Republican primary at his election watch headquarters in Orlando, Fla., Tuesday, Jan. 29, 2008. (AP Photo/Gerald Herbert)