By Simone Pathé and Bridget Bowman and Bian Elkhatib

Sen. Jon Tester, D-Mont., could face challenges from Republicans over his vote against the continuing resolution to reopen the government, and Pennsylvania might get a new district map. Senior political writers Simone Pathé and Bridget Bowman break down what it all means for 2018 midterms. Subscribe to their weekly newsletter, At the Races, here.