Only one of these, largely rooted in rural America and bolstered by ideological conservatives, supports President Trump. Two of them, urban progressives and suburban moderates, strongly oppose him. The last consists of white, blue-collar voters in the industrial states who swung Democratic in significant numbers this year but remain up for grabs.
The future of American politics and the fate of the Democratic Party hang on whether the two anti-Trump blocks can work together — and do so in ways that hold the gains the party made in states such as Pennsylvania, Michigan and Wisconsin.
The contours of our politics help explain the results of Tuesday's Senate runoff in Mississippi, where Republican incumbent Cindy Hyde-Smith defeated former Democratic Rep.