‘Dave’

The premise of this light-on-its-feet political satire, written by Gary Ross and directed by Ivan Reitman, is that William Harrison Mitchell, the humorless, ruthless, philandering President of the United States, has a double, Dave Kovic, the hang-loose owner of a temporary employment agency who wears funny ties and isn’t averse to riding a pig if the situation demands it. Recruited for a one-night stand by the Secret Service, Dave’s gig unexpectedly turns out to be a longer engagement. Sigourney Weaver plays the understandably suspicious First Lady to Kevin Kline’s President in what is the best kind of comedy--one whose jokes can’t be given away (HBO Tuesday at 9 a.m., Friday at 11 a.m.).