MANCHESTER, N.H. As Republican presidential aspirants assembled Tuesday night in Nevada for their umpteenth debate, it was clearer than ever that Republicans have gotten exactly what they had coming. Their nominating process, controlled by the religious warriors and anti-government agitators who dominate straw polls, has reached its logical conclusion: The hottest candidate in the field is Herman Cain, a fast-food tycoon who never heard of neoconservatism, never held office, has no foreign policy and a three-digit number for a domestic policy, and likes to joke about electrocuting illegal immigrants.