Must read: The Left ascendant

"With his primary election victory last week, Illinois Congressman Dan Lipinski -- a Blue Dog and cultural conservative -- won the first major 2018 battle between the Democratic Party's establishment and progressive wings. But don't be confused about what it means. The war is already over, and the establishment lost.

"Even though only two states have actually voted so far this primary election season -- Texas, a red-state redoubt, and Illinois, a blue-state stronghold -- the battle for supremacy this primary season is all but complete. In state after state, the left is proving to be the animating force in Democratic primaries, producing a surge of candidates who are forcefully driving the party toward a more liberal orientation on nearly every issue.

"These candidates are running on an agenda that moves the party beyond its recent comfort zone and toward single-payer health care, stricter gun control, a $15 minimum wage, more expansive LGBT rights and greater protections for immigrants. In the surest sign of the reoriented issue landscape, they're joined by some of the most prominent prospects in the 2020 Democratic presidential field -- Cory Booker, Kirsten Gillibrand and Kamala Harris among them -- who are embracing the same agenda."

The rest of the story:
Forget about Conor Lamb and Dan Lipinski. The progressive wing has already beaten the establishment in 2018: How the Bernie Wing Won the Democratic Primaries by Charlie Mahtesuian (Politico).