In very moving terms, Rudy Giuliani endorsed John McCain at the Reagan Library, making clear that even while he was still a candidate he had considered McCain the best choice for president if Rudy were not running himself. He spoke in glowing terms of McCain’s preparedness to lead and snuck in a dig at Mitt Romney by noting that had he not endorsed McCain, he would have been accused of flip-flopping. Rudy said they both agreed on the necessity of remaining on the offense on the war on terror, adhering to fiscal conservatism, and expanding the appeal of the GOP. Rudy declared: “He is an American hero, and America could use heroes in the White House.” McCain returned the favor, thanking Rudy in eloquent terms for his leadership on 9/11. Rudy will campaign with McCain in key states like New Jersey, New York, and California. It was a powerful image to see these friends, both stalwart and dedicated above all else to the security of the country. Unless someone throws a punch at the debate tonight, this will be the most memorable event of the day.