For the wrong reasons though (when it comes to Obamacare)...

In what is being reported as a surprise move, the 40,000 members of the International Longshore and Warehouse Union (ILWU) announced that they have formally ended their association with the AFL-CIO, one of the nation's largest private sector unions. The Longshoremen citied Obamacare and immigration reform as two important causes of their disaffiliation.

http://www.breitbart.com/Big-Government/2013/09/01/Citing-Obamacare-40-000-Longshoremen-Quit-the-AFL-CIO