Candidates in the 3rd Congressional District race have reached a stalemate in debate negotiations. The upshot: It appears Republican Jaime Herrera and Democrat Denny Heck won’t meet face-to-face in Clark County — or in Lewis County — before the Nov. 2 election.Herrera spokesman Casey Bowman said Monday that Herrera will not take part in a 30-minute candidate forum Oct. 20 in Vancouver sponsored by the Clark County League of Women Voters. He said Herrera had already made a commitment to participate in a Lewis County forum on that date.“Lewis County debate sponsors had been working on their event since September,” Bowman said. “Unfortunately, we didn’t know the League of Women Voters was hosting a debate until well after all of the other invitations.”Heck campaign manager Grant Lahmann said Heck committed to attend the League of Women Voters forum last week before he learned the details of the Oct. 20 Lewis County event, sponsored by Centralia College, The Chronicle newspaper and the Centralia-Chehalis Chamber of Commerce. “The Denny Heck campaign has sought from the start to have an accessible, direct debate with Rep. Herrera in Clark County and the League of Women Voters have a strong history of providing a fair and comprehensive format to do so,” Lahmann said. He said Heck will take part in the event whether Herrera shows up or not.