Shortly after the 2018 midterm elections, progressive groups looking at the 2020 Senate map alighted on one state where they had a chance to contest a safely Democratic seat against a centrist incumbent: Delaware.
But a bid to oust Senator Chris Coons never became a cause clbre on the left. Liberal groups instead focused on House races, where they won key primary victories over veteran congressmen in Chicago, St. Louis and the Bronx.
And today Mr. Coons, a 10-year incumbent, is the clear favorite in a primary against a progressive challenger, Jessica Scarane. A poll found him leading by 40 percentage points, a margin sufficient to dissuade groups from spending money to help Ms. Scarane.
Still, Mr. Coons has used an enormous fund-raising advantage to blanket Delawareans with television ads, spending nearly $800,000, compared with Ms. Scaranes $65,000. The only third-party organization to devote significant resources to the race has been the American Chemistry Council, which aired more than $200,000 in ads backing Mr. Coons.
Ms. Scarane, who moved to Delaware from New York 10 years ago, does not have the profile of other left-wing upstarts who have toppled incumbent centrist Democrats. Progressive organizations had first sought to recruit a woman of color to support in the race.
In down-ballot Delaware contests, Sarah McBride, a Democratic candidate for an open seat in the State Senate, is on track to become the nations highest-ranking openly transgender elected official.
Ms. McBride was the first transgender person to work at the White House when she served as an intern during President Barack Obamas administration. There are currently four openly transgender elected officials serving in lower chambers of state legislatures in Colorado, New Hampshire and Virginia.