Gerrymandering is not new. Its name comes from Elbridge Gerry, one of the Founding Fathers who was famous for his odd-shaped congressional districts, and it's been a feature of partisan politics since his time. What does gerrymandering do? What gerrymandering doesn't do is have an effect on presidential elections. The undemocratic features of the Electoral College are a whole 'nother issue, but other than in Nebraska and Maine, how Congressional districts boundaries are drawn has no effect on how electoral votes are allocated.
What gerrymandering of congressional districts does do is affect the party balance of the House of Representatives. Since the Republican-Democratic split has been so tight recently, the Republicans are looking for any advantage in order to retain their majority. But the effects of gerrymandering don't start with Congressional maps, but with how state legislative maps are drawn. The process always begins with one party gaining a majority, however slight, in a state legislature. Once they have that majority, if it's a state where the legislature draws the district maps, then they are free to gerrymander so that a slight majority turns into a large majority or even a super-majority, which is effectively veto-proof. A veto-proof majority is important because in some of these states the governor and other statewide elected officers are of the other party.
Usually redistricting takes place once every ten years, after the results of the decennial census are finalized. This determines the population of each state, which in turn determines how many representatives in Congress each state is entitled to. It also tracks any population shifts within a state. For example, after the 2020 census, the number of Nebraska's congressional representatives was unchanged (3), but the population shifted somewhat from rural to urban. In order to keep each district's population the same (or close to it) district borders needed to be adjusted. Nebraska Republicans attempted to gerrymander District 2, which sometimes elects Democrats, by dividing the majority Democratic City of Omaha between Districts 1 and 2, effectively eliminating the potential for one electoral vote going to a Democrat. (More recently they tried to revert to a winner-take-all allocation of electoral votes, which would have accomplished the same thing).
A side note: a one-party House of Representatives delegation is not proof by itself that partisan gerrymandering took place. This blog article analyzes the situation in New England, where none of the states in that region send Republicans to Congress.
In addition to New England, the following states have no Republican representatives:
- Delaware (1 district, 41% Republican)
- Hawaii (2 districts, 37% Republican)
- New Mexico (3 districts, 45% Republican)
There are also a number of states with no Democratic representatives:
- Alaska (1 district, 41% Democratic)
- Arkansas (4 districts, 34% Democratic)
- Idaho (2 districts, 30% Democratic)
- Iowa (4 districts, 42% Democratic)
- Montana (2 districts, 38% Democratic)
- Nebraska (3 districts, 39% Democratic)
- North Dakota (1 district 30% Democratic)
- Oklahoma (5 districts, 32% Democratic)
- South Dakota (1 district, 34% Democratic)
- Utah (4 districts, 38% Democratic)
- West Virginia (2 districts, 28% Democratic)
- Wyoming (1 district, 26% Democratic)
- Equal population distribution
- Contiguity
- Compactness
- Respect for existing boundaries
- Minority representation
- Preservation of communities of interest
- The House of Delegates had to pass a resolution for a referendum to amend the state constitution to allow redistricting
- An election had to have occurred
- The House of Delegates had to pass the resolution for the referendum a second time after an election (in other words, there had to be an election between the two House of Delegates actions)
- The State Senate had to vote to approve the resolution
- The Governor had to sign off
- The referendum needed to be put up for a vote of the people
- The referendum had to receive a majority of the votes
- The district maps could then be redrawn by the legislature






