On occasion, Republicans Rep. Bartlett and Rep. Gilchrest vote with Democrats in the house. Maryland's unified vote against the Torture bill was a great example of this phenomenon.
Today that was not the case, and Maryland's two Republican Reps voted against working people and against the Employee Free Choice Act. All of Maryland's Democratic House members voted for the Bill. For a better analysis of the issue than I can give here, check out this mydd post.
Generally, I stand with unions. I find it much more easy to believe that big business is more actively involved in subverting workers rights than unions. I fear much more the lack of an ability to organize than workers being forced to do so.