"They only pick up white trash"

The American Nazi party has volunteered to pick up trash alongside a rural Oregon road -- and received a plaque along the way crediting its good work:

"American Nazi Party" is written on the sign, which is part of the "Adopt-A-Road" program that encourages local groups to clean up road litter in exchange for recognition on small signs...
Marion County officials say there is nothing they can do about the Nazi litter pickup because barring the group from the program would violate its First Amendment free speech rights.

What interests me is why the Nazi party would volunteer to be part of the program in the first place. Do they really think that portraying themselves as good citizens will help them overcome the rather massive electoral liability of their party's name?

UPDATE: The signs have been vandalized and removed.