Seth Wenig, Associated Press
John McCain and Rudy Giuliani stand for the national anthem at Yankee Stadium on Sunday. Gillian Anderson

Republican presidential candidate John McCain stayed closer to home Sunday, visiting Yankee Stadium with former Mayor Rudy Giuliani.

The two high-profile Republicans are longtime friends, despite having campaigned against each other in the GOP primaries in which McCain ultimately prevailed. When Giuliani bowed out of the race, he immediately endorsed McCain.

Could Giuliani, who moonlights as the No. 1 Yankee fan, become the No. 2 on the Republican ticket?

"You hear all kinds of stuff, but I'm not thinking about anything but helping to get him elected," Giuliani said. "Beyond the fact that he's the candidate of my party, he's a very good friend."

Before the game, McCain, Giuliani and Giuliani's wife, Judith, went onto the field, chatting with Yankees manager Joe Girardi and Oakland A's manager Bob Geren.

When Geren asked McCain what it's like to run for president, McCain answered, "It's like being in AA (minor league baseball) and all of a sudden you're playing in Yankee Stadium."