When House Speaker Paul Ryan ( R-Wis.) and Rep. Dennis Ross (R-Fla.) announced last Wednesday they won’t be running for reelection this year, they became the latest GOP lawmakers to decide they’ve enjoyed as much of partisan politics as they can stand. In my view, Speaker Ryan’s impending departure will be another big blow to the already fractious and fractured Republican Party. By joining the ranks of 25 House members who are calling it quits, with more political casualties to come, he becomes a “lame duck leader” at a time when party unity is crucial to crushing a rising wave of Democrats seeking to regain control of the House following the midterm elections in November.