MADISON, Wis. (AP) -- Candidates in four of Wisconsin's eight congressional districts look headed for primaries on Aug. 9. Nomination papers aren't due until Wednesday, but here's an early look at the probable match-ups:
--Four Democrats -- Mary Hoeft of Rice Lake, Phil Salamone of Schofield, Joel Lewis of Wausau and Ethel Quisler of Wausau -- are vying in the primary in northern Wisconsin's 7th District to take on incumbent Republican Sean Duffy in November. Duffy is seeking a fourth term.
--The highest-profile race is in southern Wisconsin's 1st District, where House Speaker Paul Ryan faces a challenge from inventor Paul Nehlen of Delavan. U.S. Army veteran Ryan Solen of Mount Pleasant and plumber Tom Breau of Janesville, face each other in a Democratic primary. The Republican and Democratic survivors will meet in the November election.
--In east-central Wisconsin's 6th Congressional District, Michael Slattery of Maribel and Sarah Lloyd, a Wisconsin Dells farmer, will face off in a Democratic primary. The winner will advance to face incumbent Republican Glenn Grothman in November.
--Three Democrats and two Republicans are running to replace retiring Republican incumbent Reid Ribble in northeastern Wisconsin's 8th Congressional District. The Democrats include Jerry Kobishop of Sturgeon Bay, Wendy Gribben of Wausaukee and Tom Nelson of Appleton. The Republicans are Gary Shomburg of Lakewood and Terry McNulty of Forestville. The winners in each primary will face each other for the seat in November.