Barack Obama is reportedly getting the endorsement of the Change To Win labor federation, made up of seven big unions that bolted from the AFL-CIO in 2005 to pursue a more activist course. Obama was already endorsed by four of the members unions: SEIU, UNITE-HERE, the United Food and Commercial Workers, plus yesterday's endorsement by the Teamsters. In total, the federation's member unions claim six-million members.

One of Obama's weaknesses in the earlier part of this cycle was a difficulty breaking through among blue-collar voters. But the situation has changed drastically with his recent wins in states like Maine and Wisconsin, and the new series of labor endorsements reflects just how much progress he's made and could very well continue to accomplish.