I'm still shopping at Target and I still support same-sex marriage

There's a boycott going on in our area against Target for its contributions to MN Forward, a group that has backed Tom Emmer, the Republican candidate for Minnesota governor. Mr. Emmer is against gay marriage.

Of course, I love the idea that these political contributions have consequences to the businesses that make them, but this boycott against Target doesn't quite make sense to me. Here's the problem: I don't think very many people who've started buying their paper towels at Cub Foods instead have investigated Cub's political donations.

Cub is owned by SuperValu, Inc. Its political action committee has donated to a lot of Democrats, but it also has supported Republican candidates who are against gay marriage. One example, Joe Linus Barton:

Maybe the scale of Supervalu's donations (via a PAC) is small enough, compared to Target's contribution to MN Forward, that it's a different animal, but I daresay that lots of boycotters haven't considered whether their alternative paper-towel source is really better.

And, by the way, has anyone checked on political contributions of the manufacturer of those paper towels (and everything else)?