End of year TPM game. Which is most likely to cause the inevitable collapse of Mitt Romney's presidential campaign?

1. History of ridiculous flip-flops on gay rights.

2. Fact that all he's ever done in politics is win one gubernatorial election in Massachusetts.

3. Fact that his real first name is Willard.

4. Not a genuine conservative nutjob.

Choose one of these or come up with one of your own.