CNN: 9 Democratic primaries to watch in 2018

7. Rhode Island: Progressives keep chipping away

Rhode Island state Rep. Aaron Regunberg

Rhode Island state Rep. Aaron Regunberg

State Rep. Aaron Regunberg jumped into the lieutenant governor's race in Rhode Island on Tuesday, setting up a showdown with incumbent Democrat Dan McKee.

The 27-year-old Regunberg supported Sanders in 2016 and will have the Working Families Party, one of the progressive organizations that helped lead the successful statewide charge to expand sick leave in the state, boosting his bid. (Regunberg sponsored the House version of the leave bill.)

Gov. Gina Raimondo, a moderate Democrat, is expected to win her 2018 re-election bid, so victory for Regunberg, viewed for now as a narrow underdog, would create an interesting dynamic in Providence -- and a chance to see if the party's two poles can get along and run a state government.

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