LA Times: Barack Obama on Saturday cited an escalating argument over a proposed federal gas tax holiday as evidence that his Democratic presidential rival, Hillary Rodham Clinton, is prepared to tout dubious policy if it might help her win an election. Speaking to an audience at a high school today, Obama said the proposal — which also is backed by the presumptive GOP nominee, John McCain — would save people the equivalent of half a tank of gasoline. That assumes the oil companies don’t raise …