Cheney "is likely to launch her bid for Congress within days."
The progressive group is backing Nanette Barragán over the retiring lawmaker's pick.
Rep. Bob Dold of Illinois is the first GOP lawmaker to endorse the Equality Act.
The Republican's retirement will offer Democrats a pickup opportunity.
The NRCC argues Penn's money is tainted by his interview with El Chapo.
The six-term lawmaker serves on the Benghazi Committee.
The former DCCC chair says he wants to "spend more time writing [his] second novel."
McDermott has served in the House since 1989.
Lisa Hagen 01/01/16 03:51 PM EST
There are open seats, incumbent challenges and crowded primaries.
The state party is afraid voters will be confused with the retiring congressman.