"Show me just what Mohammed brought that was new, and there you will find things only evil and inhuman, such as his command to spread by the sword the faith he preached." - Manuel II Palelologus
Look at the last two elections. If he gets beat by a whisker or an Electoral College fluke he will not survive politically to run again. His loss will be explained internally in the Moveon and Answer orgs as from ideological impurity and he will fall out of favor.