https://www.rollingstone.com/politics/news/gop-rigs-elections-gerrymandering-voter-id-laws-dark-money-w515664
"This isn't just a problem in Wisconsin. Following the 2010 elections, Republicans had full control of the redistricting process for state legislative and U.S. House seats in 21 states, compared with eight states for Democrats. Republicans now hold as many as 22 additional House seats because of gerrymandering, according to an analysis by the Associated Press – nearly the same margin as the 24 seats Democrats need in order to take back the House. During the 2012 elections, Democratic House candidates won 1.4 million more votes nationally than Republicans, but the GOP won 33 more seats."
