Packaged as a rollicking political comedy, writer-director Barry Levinson's much-ballyhooed reunion with Robin Williams, his GOOD MORNING VIETNAM (1987) and TOYS (1992) star, wobbles unsteadily between broad humor and paranoid thrills. The result is a bland muddle, told — for no apparent reason — in flashback by wheelchair-bound Jack Menken (Christopher Walken). It begins at a preshow warm-up, as popular late-night TV personality Tom Dobbs (Williams) readies his audience for another round of potshots at politicians. One girlish fan suggests that since most elected officials are a bad joke, Dobbs himself might as well run for president. Dobbs treats the idea as a fodd...