“Competitive congressional districts have been steadily disappearing for decades. In the current redistricting cycle, six highly competitive districts in the House of Representatives were drawn out of existence. The Cook Political Report estimates that less than 8 percent of congressional districts will be competitive come November.
This is a problem. It’s not because competitive districts are a powerfully moderating force on our democracy — instead, the decline of competitive districts is a problem that reflects deeper causes of partisan polarization and leaves the overwhelming majority of Americans in places where their votes don’t matter, and where parties and candidates don’t need to work for anybody’s votes.
Governing in America requires compromise. But when over 90 percent of congressional districts lean toward one of the two major parties, that means most representatives have little incentive to compromise. In fact, representatives increasingly face strong pressures to be very partisan, which has made governing very difficult.”
https://fivethirtyeight.com/features/what-we-lose-when-we-lose-competitive-congressional-districts/