Republican Gov. Arnold Schwarzenegger is leaving open the possibility of backing Democratic Sen. Dianne Feinstein for re-election, despite an impassioned appeal from her GOP rival, former state Sen. Dick Mountjoy. Schwarzenegger surprised his Republican backers shortly after the primary when he said he would have no problem endorsing a Democrat for office this year. "If I like someone, absolutely,'' he said at a June 8 campaign stop in Antioch. While the governor didn't name any names, Steve Schmidt, his campaign manager, wasn't quite so circumspect. "Like most Californians, (Schwarzenegger) thinks Dianne Feinstein is a great senator,'' Schmidt said. While Schwarzenegger...