With early voting starting in less than a month, Illinois will be a testing ground for Democrats’ ability to nominate general election candidates they think can win out of crowded primaries.

The Democratic Congressional Campaign Committee is targeting four Republican-held districts, but the committee is not explicitly picking favorites in all those primaries.

In two competitive districts — the 6th and the 13th — Democratic candidates who have won the primary before but fallen short in the general election are running again. Even though they’re not raising much money, there’s still fear among Democratic campaign veterans that they could sneak by in the primary.

“They’re almost like quasi-incumbents because Democratic primary voters voted for them before,” one Democratic strategist in the state said.

Watch: How the Open Seats Are (or Aren’t) Creating Opportunities in the House