For months, energy consultants warned that increasing gasoline prices might never come down. Now, some of those same consultants say there might be a dramatic plunge after all. As prices decline, President Bush's poll numbers are inching up. A Gallup poll shows that 42% of Americans think that gas prices are falling because of manipulation by the Bush Administration. Oil experts sneer at the idea of such a conspiracy, saying that market forces are too complex and involve too many people.