A Republican state legislature drawing Congressional district boundaries to help keep the Republicans in power.
That same legislature getting caught trying to restrict voting access in direct violation of the Voting Rights Act. They basically took a study showing what things were most popular in African-American areas (early voting, easy registration, etc.) and came up with a set of restrictions that specifically ("Surgical precision", said the judge who struck down the proposed laws) targeted those things.
Basically, it's the GOP doing everything possible - other than appeal to the majority of voters - to stay in power.