Before he falls out of the top tier of GOP White House hopefuls, chief advisers to Sen. John McCain are urging him to quit his day job and become a full-time presidential candidate. "Just resign," one says he told McCain. "Show you're all in." Advisers say being a senator is a drag. He doesn't have enough time to campaign and raise money. Worse: The issues he has to vote on, like immigration reform, are killers. If McCain takes that advice, here's the game plan. "Pick three issues conservatives care about and nail them," says one adviser, "and attack [Sen.] Hillary Clinton every day. He needs to break out, and becoming the anti-Hillary will work."