Bumperstickers, Bumperstickers!

I took a short blipwalk late this afternoon, and just after I turned around to come back, I saw the back of this car. I immediately thought, this belongs to a real Northamptonite (we're well-known as a very liberal town, even for Massachusetts)--and then I caught sight of the California license plate.

However, the owner must have some local connection: the text at the lower left, "Books you don't need, in a place you can't find" is from the Montague Bookmill in a rural area north of us (I've been there once, and when I was in the area again I couldn't find it!).