GOP lawmakers are fleeing for the exit in droves, with many pointing to a Congress they argue has grown too dysfunctional and a demanding schedule that leaves little time for their families. More than 50 lawmakers in both parties have announced decisions to leave their seats, scrambling the calculus on both sides of the aisle ahead of next year’s high-stakes midterms. The wave of exits could be particularly ominous for Republicans in charge of the House and Senate. The number exiting is nearly on par with 2018, a dismal midterm year for the GOP. Some lawmakers frustrated with inaction on...