BAGHDAD, Iraq - Two car bombs ripped through crowded Baghdad streets on Monday, killing at least 21 people and wounding 96, as insurgents step up their campaign to undermine the country's U.S.-backed interim government and drive the United States and its allies out of Iraq.    In the first explosion, a four-wheel-drive vehicle packed with explosives detonated outside the heavily fortified Green Zone, the seat of the U.S...

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