Here's how to do it...
At the beginning of the debate, both candidates shake hands and exchange "pleasantries". When Kerry comes to shake Duh's hand, he casually pats Duh on the back with his left hand during the "pleasantries". If he detects any lumps or bumps, he could make a remark at the beginning enquiring about the pResident's health, noting that there appears to be some kind of "growth" on Duh's back.
Then watch the squirming begin....
jb4
shrub\ufffdbish (Am., from shrub + rubbish, after the derisive name for America's 43 president; 2003) n. 1. a form of nonsensical political doubletalk wherein the speaker attempts to defend the indefensible by lying, obfuscation, or otherwise misstating the facts; GIBBERISH. 2. any of a collection of utterances from America's putative 43rd president. cf. BULLSHIT