Congressional mapmakers receive "F" grade in five states

Partisan legislators across the country have been busy manipulating district lines to bolster their party's chances of controlling the House next year, according to analysis of maps by the Princeton Gerrymandering Project and RepresentUs.

By the numbers: Nineteen states have now finished the redistricting process, and Georgia, New Mexico and Virginia are awaiting only a final signature on their plans. The Redistricting Report Card project has released grades for seven of these 22 maps. Five received an F.

Six of the remaining 28 states do not have congressional redistricting, as they only have one House seat.

Between the lines: The early results from the project reveal less gerrymandered maps in states where independent commissions are in charge of the process —such as in Colorado and Arizona.