The relationship between the American labor movement and the Democratic Party has long been fairly predictable. For the better part of a century, labor has depended on the Democrats for favorable policy, and the Democrats have depended on labor for votes. Few from either side of the bargain anticipate an immediate future where that arrangement will be upset.
So when rumblings started coming out of Ohio late last year about breaking with the Democrats, many in the labor movement were startled. Last November, in the small county of Lorain, Ohio, local labor leaders who were intimately wedded to the Democratic establishment broke rank and supported three independent pro-labor candidates in county elections, all of whom won.


More... (http://inthesetimes.com/working/entry/17227/defeat_democrats_independent_labor_party_ohio_lorain_county_unionists/)

Perhaps this is a start, but to even consider using this as a means of imposing labor interests upon the Democratic Party is an exercise in distraction. There is no commonality. the Ds are as bad for labor as Rs & more devious too. The break should be complete with no looking back.