The group saving political moderates

Illinois Rep. Dan Lipinski. Photo: Tom Williams/CQ Roll Call via Getty Images

A centrist coalition called Country Forward that supports middle-of-the-road candidates in both parties helped Illinois Rep. Dan Lipinski fend off a progressive primary challenge this week. The group had help from political technology firm Applecart, which helped Conor Lamb in his Pennsylvania victory over Republican Rick Saccone.

Why it matters: These groups' involvement adds to the tension in the Democratic party this year between centrist members of Congress and progressive challengers. Lipinski has been criticized for being too conservative (he voted against the Affordable Care Act and the DREAM Act) and Lamb campaigned as a pro-gun Democrat.