In other research we find that commissions or courts also do a better job than state legislatures at creating more competitive district maps.
Tom Wolf and Senator Bob Casey, both Democrats, fighting to keep their seats this November, but congressional districts have been rendered more competitive under a redrawn map, making the state central to any Democratic path back to a House majority in Washington.
The two parties agreed on one conclusion: Over all, the new map is more competitive than the one in place for the past 10 years.
In California, Republicans say the changes, over the long term, have the potential to transform to GOP into a more competitive party, because the new map and the new voting system may force it to nominate centrist candidates who can appeal to the state's burgeoning population of minority voters.
Maps drawn by such panels are more compact, more competitive and respect local boundaries more than maps drawn by state legislators, said Michael Crespin, a professor of political science at the University of Oklahoma.
Even without the explicit charge to increase competitiveness, the California commission created a map that was far more competitive than its predecessor drawn by the Democrat-dominated state legislature.
Several analyses showed the court's map will make elections more competitive and give Democrats a better chance of winning seats in districts currently held by the Republicans.
The Senate map in 2020 may feature more competitive races for Republicans than Democrats, a reversal of the situation in 2018.
The Supreme Court could make such a determination in the Wisconsin case, which could remake American politics by requiring states to draw maps that put lawmakers in more competitive races.
The map the court drew is considerably more competitive than the 2011 plan the GOP is fighting for.
