What are some top ways to ruin an election?

Serve sandwiches with mayo in them. 

Serve avocado toast. 

Have it administered by AnswerMug. 

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1a. Use hackable voting machines.
1b.That enable cheating. 
1c. Machines that enable fractional voting.
1d. Machines that do not keep a record of the original ballot in question.
2. Illegally change rules.
3. Fail to enforce any election integrity laws. 
4. Allow dead and out of state voters. 
5. Do not allow legal election observers to observe.
6. Turn down signature verification machines to the point it approves almost any scribble.
6. Mail in voting. (Unsolicited ballots mailed to every registered voter knowing the registration list is incorrect)

There is more but this is a good start.

Have Trump on the ballot.