Opponents of Gov. Scott Walker for months have been urging people to boycott companies linked to donations to Walker’s campaign. Now there is an effort under way to expand the boycott nationally to encourage people to go into stores and place stickers on products.

Among products targeted for stickers are Johnsonville brats, AngelSoft toilet paper, Sargento cheese and Coors beer.

The grocers group has produced a sign that stores can post alerting people that placing stickers on products in stores is illegal. But the trade group’s chief executive officer, Brandon Scholz, said he didn’t expect the proponents of the sticker campaign to be successful.