No, you don’t have to support their man. But is electing Obama for a second time something conservatives are willing to see? Another question, this is a primary process. If someone like a Romney who is despised here, not without cause, or Gingrich, who is viewed as unreliable,should earn the nomination through the vote of the primaries should conservatives reject those results?
If it means the end of the GOP, then yes, it might be worth it.