Step one: Let an outside group air attack ads about your opponent that even you find deliciously offensive and delightfully disturbing.
Step two: Distance yourself from the ads and make it seem like you’re the one being attacked by your opponent (for accusing you of backing the ads) and by the system (they shouldn’t even allow those mean old 527s to run ads in the first place).
Step three: Wait for your opponent to slam the ads.
Step four: Make it seem like your opponent (in defending his record) has sort lost his mind and is not quite stable enough to lead. Code words should include: Unhinged. Wild-Eyed. Losing his cool. McCain.