PROMISE KEEPERSWho will blink first?http://tpmdc.talkingpointsmemo.com/2012/04/obama-to-gop-abide-by-the-debt-limit-deal-or-else.phpIn a major escalation of a slowly building fight over funding the government, the White House has warned House Republicans, in no uncertain terms, that the government will shut down in September if the GOP does not adhere to an agreement they cut with Democrats in