Progressives fight for leverage amid ever-slimming majority

Progressives are ascendant in the Democratic-controlled Congress, but they may not have the political leverage to dramatically shape legislative priorities like President Biden’s infrastructure and jobs package as they return to Washington this week with an even slimmer majority.

Democrats will need near-total cooperation among everyone in their House and Senate caucuses to pass any bills on their own without GOP support.

And while it means only a handful of Democrats can hold up a bill, it also means that they will all be under more pressure than ever to...