Faced with a barrage of negative portrayals — a much-hyped investigative book, a Levi Johnston memoir and a new movie — Palin is finding support in the unlikeliest of places.

Film reviewers have slammed the British documentary “Sarah Palin: You Betcha!” Newspapers have refused to run comic-strip excerpts of Joe McGinniss’s rumor-mongering tome “The Rogue.” Johnston’s accusations have been consigned to the gossip pages. And none other than The New York Times has angrily taken Palin’s side in a brutal takedown of the McGinniss book…

And then there’s “You Betcha!” a cheerfully ruthless documentary about Palin from Nick Broomfield, whose past subjects have included Kurt Cobain, Margaret Thatcher, Heidi Fleiss and Tupac Shakur.

The film premiered last week at the Toronto International Film Festival, and it wasn’t exactly a critical darling.

Variety called it “a sarcastically toned, strategically timed character assassination” that “lacks sufficient humor and insight to make it a must-see for anyone outside the Brit muckraker’s fan base.” Other critics called it “obnoxious” and “unnecessary.”