In the spirit of full disclosure, I think they should advertise the fact. Hence, I am soliciting suggestions for a new line of bumper stickers. Feel free to insert your own.
"I Believe in (Someone Else) Buying American"
"My Help Drives a Chevy"
"I Support The UAW -- I Just Won't Own Anything They Make"
"Unions Build Better Benefits. Cars, Not So Much"
"I Voted Democrat So I Didn't Have To Buy Their Crap"
"Solidarity Forever, Except When It Comes to My Money"