The two-year attempt to push immigration reform through Congress is effectively dead and unlikely to be revived until after President Obama leaves office, numerous lawmakers and advocates on both sides of the issue said this week. The slow collapse of new border legislation marks the end of an effort that Democrats and Republicans have characterized as central to the future of their parties. The failure also leaves about 12 million illegal immigrants in continued limbo over their status and is certain to increase political pressure on Obama from the left to act on his own. Read more at The Washington Post…