‘Dave’

The premise of this light political satire, written by Gary Ross and directed by Ivan Reitman, is that William Harrison Mitchell, the humorless and philandering President of the United States, has a double, Dave Kovic. The film’s title character is the owner of a temporary employment agency who wears funny ties and isn’t adverse 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 Saturday at 9:30 a.m. and 5 p.m.).