How much can gerrymandering swing elections? In the hypothetical Maryland map on the left, 4/8 districts would've voted for Trump by 5%+ in '20. In the one on the right, 8/8 would've voted for Biden by 15%+. Not kidding. pic.twitter.com/rjEqMSwdt5

— Dave Wasserman (@Redistrict) April 10, 2021