Michael Douglas is the only life in this dull party playing a politically motivated prosecutor who may be tampering with evidence to boost his conviction record. At least that’s the thinking of Jesse Metcalf (right, the shirtless stud from Desperate Housewives) as a reporter trying to make his case with the unwitting help of the DA’s hottie assistant (Amber Tamblyn). How to nail the smooth old rascal? The reporter gets himself arrested for murder, having his cameraman colleague (Joel David…