Rip Rense didn't toil in the media for 25 years without learning how to work the news hacks like me. Yesterday, he slipped word of his book signing, and I did an item. Today comes his weekly column, which I can't ignore for two reasons. One, it begins with the John Carroll memo on L.A. Times liberal bias that L.A. Observed was the first to publish. Then he whistles a fastball at the chin of LAT staff writer Roger Vincent, who interviewed developer Alan Casden about his desire to buy the Dodgers, build a downtown stadium and tear down Dodger Stadium to erect housing. I found the story fine, but Rense says: