Who's going to be pushing the hardest for cleaner cars in the U.S. - hybrids, PHEVs and CNG vehicles, specifically - in the coming years? According to HybridCars, it will not be Plug In America or AutoblogGreen readers; instead, it could be President Obama's White House chief of staff: Rahm Emanuel. HybridCars suggesets that Emanuel, "a devout Jew," might use his personal desire to see America extract itself from Middle East oil as a reason to push for more fuel efficient vehicles. Emanuel's legislation history includes introducing the American Hybrid Tax Credit Act in 2005 and sponsoring legislation that would have created an NGV mandate for automakers. Emanuel also wrote a book in 2006 called The Plan that includes a chapter on getting off of gas that was very bullish on plug-in hybrids - and ways that the government could support purchases of these vehicles. There's a lengthy excerpt from that chapter over at HybridCars. Now that he's as close as anyone to the man in charge, there's a good chance Emanuel's words are a heard in a different way than before.