Republicans' internal divisions, and divisions with President Trump, made legislating nearly impossible during Trump's first term. There's little sign that thing would be different should he be re-elected.And Sen. Ed Markey, Democrat of Massachusetts, won his primary against Rep. Joe Kennedy III. Congressman Richard Neal, chairman of the House Ways and Means committee, also held-off a insurgent challenger. But the contests illustrate a new reality of Democratic politics: primary challenges are here to stay.This episode: campaign correspondent Asma Khalid, congressional reporter Kelsey Snell, and congressional editor Deirdre Walsh.Connect:Subscribe to the NPR Politics Podcast here.Email the show at nprpolitics@npr.org.Join the NPR Politics Podcast Facebook Group.Listen to our playlist The NPR Politics Daily Workout.Subscribe to the NPR Politics Newsletter.Find and support your local public radio station.