I don't know if anyone else has said they wouldn't go to a concert just because of politics, but as for me, I just don't like much of his music. Him being 'somewhat' political in the past only means I don't care enough to try very hard. I'm sure he doesn't miss me not being there.I went to two Bruce concerts last year, and I don't believe he mentioned anything overtly political at either. He was very vocally political at the end of the W era, and very much supportive of Obama. This has largely though not completely subsided in more recent years.
So if that's your hangup, go and enjoy.
I go to a good many concerts though, politics or not. I was at a Dead show a couple weeks ago and I would bet Bob and I would disagree on some stuff.