The way they always do: with "you're an Obama supporter".
Ripped right from the old Democrat political playbook. If you don't support my guy then that means you support the devil. That has never worked for me, it's so childish and immature and reflects poorly of the one espousing such petty rhetoric.
I make my choices based on what I think is best and not what some political whore-monger is screaming at me. The more and louder they scream the entrenched I become. I will not vote for Romney nor Obama but I will vote. Both candidates are corrupt and vile.