Assuming the election permits it, the option of adding who you would want should your main pick not succeed.

For instance, let's go back to the 90s. Bush Clinton and Perot. Perot took enough votes away from Bush to cost him the election to Clinton.

Ballot:
Clinton
Bush - 2nd
Perot - 1st

Had Perot not won, Bush would have picked up those who had marked their ballot that way. Same goes for Clinton if they marked Perot first and Clinton second.


lolwut