Democratic primaries are forcing the party to make tough calls on strategy that could determine its future direction.

As tensions over the 2016 presidential primary still fuel divisions between establishment and progressive Democrats, the party has started picking sides in midterm primary battles. After the Democratic Congressional Campaign Committee ignited controversy for attacking progressive candidate Laura Moser, a more progressive group, Our Revolution, aligned with Sen. Bernie Sanders, I-Vt., endorsed her bid for a House seat in Texas.