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Gerrymandering has been around a long time (since 1744) and both parties have used gerrymandering to achieve their purposes. One of the most extreme is the 4th Congressional District of Illinois, which heavily favors the Democratic Party (It has a Cook PVI of D+33). From a "satellite view" it looks like the pincers of a lobster:
Maps of the most gerrymandered districts are actually a little comical, and North Carolina's District #12 is the worst in the country.
Fortunately, keeping the citizenship question off the census means that gerrymandering will not get worse, and recent court victories in Pennsylvania and North Carolina indicate things are improving a little bit.