JEFFERSON CITY, Mo. (AP) — A conservative group is launching an advertising campaign against Missouri Republican lawmakers who don’t support right to work.

Television ads paid for by Americans for Prosperity began running in Rep. Kathie Conway’s district Tuesday.

The St. Charles Republican didn’t immediately return requests for comment.

At issue are Republican House members such as Conway who helped defeat a measure that would bar mandatory union fees in Missouri. It fell 13 votes short of a veto override in the House earlier his month.

The advertisements generally attempt to tie House Republicans who voted against right to work to Democratic President Barack Obama, who also opposes it. One ad urges voters to call Conway and ask her to support the measure.