The republicans actually did a huge push back then, as a resident of North Carolina, we got a huge example of it and are one of the states where the districts were recently ruled to illegally favor them. They actually got the districts in many states back then.
In North Carolina for example due to their fuckery, with a 50/50 split in the popular vote, our 13 seats are split 3 to democrats and 10 to republicans. Had one election where our vote was splitting something like 55/45 in favor of the democrats still have the seats only get split 4 to 9 in favor of the republicans and are also one of the states where they have been caught trying to disenfranchise minority voters with ID laws where they had records where they were pulling up the IDs each race statistically lacked the most and were surgically requiring the ones minorities most lacked.
Using
https://en.wikipedia.org/wiki/United...lections,_2010
as a source just for quick reference, the Republicans held 51.7% of the seats back then and gerrymandered the living fuck out of the states they owned.