Which party is more "blue collar"

[useful idiot]

Depends on how broad your definition of "blue collar" is, and as Lewis mentioned, whether or not you're including minorities. Even if you're only talking about blue collar whites, those who fit into that economic classification in Massachusetts are different from those who do in Tennessee.

I'd honestly say that both parties appeal to all economic categories, other than the completely destitute, who are by and large apathetic but kneejerk Democrat. Things like race, religiosity, personal taste, and broader cultural identification are far more important...