Ohio Rep. Rick Nolan faces a tough reelection campaign.
Attorney Doug Owens will face a rematch with Love.
Bob Poe said going public with his diagnosis will let him work to remove fear and stigma.
Pittenger was ahead by 142 votes at 11:30 p.m.
Jim Mowrer will face Rep. David Young (R-Iowa) in the fall.
Conservative groups mounted a campaign against the Republican congresswoman.
She will face Rep. Rod Blum in November.
Conservative businessman Warren Davidson won the special election on Tuesday.
Jones held off former Bush administration official Taylor Griffin in a rematch.
Ellmers is the first incumbent Republican in the House to lose a primary this year.