MILWAUKEE (AP) — U.S. Representative Tom Petri is saying goodbye at the state Republican convention in Milwaukee. Petri, a moderate, has held the 6th Congressional District seat for 35 years. He decided last month to retire rather than face a primary challenge this fall from state Senator Glenn Grothman, one of the most conservative lawmakers in the Legislature. Senator Joe Leibham, a Sheboygan Republican, and Representative Duey Stroebel, a Saukville Republican, have since jumped into the race. So have Democrats Gary Wetzel and Mark Harris. Petri sounded broad themes during his farewell speech at the convention Saturday. He called on Republicans to embrace diversity, noting the party was founded by people of varied political stripes. He left the stage to a standing ovation.