Axios Jun 25
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Gerrymandering gives GOP huge structural advantage
AP analysis of election data

Republican gains in statehouses during Obama's first midterm produced a priceless advantage when House districts were redrawn after the 2010 census, and AP has quantified that in a fascinating way:

"Republicans [last year] won as many as 22 additional U.S. House seats over what would have been expected based on the average vote share in congressional districts across the country. That helped provide the GOP with a comfortable majority over Democrats instead of a narrow one."