Candidate PDA: Real Or Staged?

By PDA, for my extra-geeky readers, I mean public displays of affection, not personal digital assistants. ABC wonders about camera-caught kisses (Gores), lovey-dovey calls taken in the middle of speeches (Giulianis), and romantic cavorts on the beach (Clintons): genuine goopiness or photo op? If you're in the middle of a nasty argument and they ask you to pose in a lip-clench, movie stars like Fred Thompson definitely have the edge.