DO: Mean it.
DON'T: Not mean it, get caught in your politically-motivated lie, then spend the next couple of weeks getting raked over the coals by David Letterman.
DO: It so that you can visit your sweet old grandma (who helped raise you) because she has fallen ill.
DON'T: Try to pretend that you have a grandma in a desperate attempt to keep pace with your opponent, for you might be as old as--if not older than--a large percentage of actual grandmas.
DON'T: Lose. (But...black, gay, literate, female polar-bear-God-willing, Goofus...you will.)