From gerrymandering to obstructing Congress with regard to Russian interference and everything between (purging voter rolls, limiting polling hours, making it difficult to get ID but requiring it to vote, etc etc etc)
Gerrymandering doesn't affect the POTUS election, only House of Representatives voting. For POTUS, most states go by popular vote of the entire state with a winner-take-all of electoral college votes. Senate seats are also obviously winner-take-all.
The other stuff I agree with.