https://election.princeton.edu/2012/...es-do-it-myth/
The AP scrutinized the outcomes of all 435 U.S. House races and about 4,700 state House and Assembly seats up for election last year using a new statistical method of calculating partisan advantage. It’s designed to detect cases in which one party may have won, widened or retained its grip on power through political gerrymandering.
The analysis found four times as many states with Republican-skewed state House or Assembly districts than Democratic ones. Among the two dozen most populated states that determine the vast majority of Congress, there were nearly three times as many with Republican-tilted U.S. House districts.
A separate statistical analysis conducted for AP by the Princeton University Gerrymandering Project found that the extreme Republican advantages in some states were no fluke. The Republican edge in Michigan’s state House districts had only a 1-in-16,000 probability of occurring by chance; in Wisconsin’s Assembly districts, there was a mere 1-in-60,000 likelihood of it happening randomly, the analysis found.
The AP analysis also found that Republicans 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.
1. Republicans’ gerrymandering increases seat share by 9.1%. Over 20 years For Democrats, the study found no significant overall increase in congressional seat share when the party controlled redistricting. Democrats having legal control over redistricting does little to swing the seat share in their favor—or to correct the disproportionality drawn by Republicans. Conservatives use the redistricting pen to draw maps advantageous to their electoral chances—and they do so enthusiastically, netting partisan benefits that last for a decades worth of elections.
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