Booed by Republicans for his isolationist foreign policy views and anathema to Democrats for his anti-government philosophy, the Texas congressman was proudly out of step with both political parties. But marching to his own drummer, the grandfatherly libertarian found himself leading an online parade. Millions of dollars poured into his quixotic presidential campaign, raising an inevitable question: What's next for this free-thinking and strangely compelling grassroots crusader?