Sen. John McCain swept the so-called Potomac Primary Tuesday night, winning Virginia, Maryland and Washington, D.C.
It's a striking contrast to last summer, when McCain's presidential campaign was on life support. He had no money, and staffers were leaving in droves.
Among the few advisers who stayed — and helped orchestrate the senator's resurgence — is the same man who helped George W. Bush crush McCain's first presidential campaign in 2000: senior adviser Mark McKinnon.
But even after scoring big gains Tuesday, McCain may not have the nomination sewn up. Many Christian conservatives say they need to hear more before rallying around the party front-runner.
Michele Norris talks with McKinnon about the challenges still facing McCain — and about why McKinnon once said he will not work for the campaign if Sen. Barack Obama is the Democratic nominee.
McKinnon says the strategy that propelled the campaign from last summer's doldrums to Tuesday's big sweep was, simply, to "stay in the game."