. . . Mark McKinnon, a former adviser to Sen. John McCain (Ariz.) and other Republicans, said there is an "opportunity for Republicans" to tap into legitimate fears about an overreaching federal government. But he said that "right-wing nutballs are aligning themselves with these movements" and are dominating media coverage. "It's bad for Republicans because in the absence of any real leadership, the freaks fill the void and define the party," McKinnon said. . . .