I mean, aside from the DNC's emails [2] [3] and gaining access to Arizona and Illinois voting records [1]. I'd personally put 1 to 4 odds against direct modification of voting numbers, given that voting machines are woefully insecure [4].

[1] https://www.washingtonpost.com/world/national-security/fbi-i...

[2] https://www.usnews.com/news/world/articles/2017-11-03/inside...

[3] https://www.cnn.com/2016/12/26/us/2016-presidential-campaign...

[4] https://www.defcon.org/images/defcon-25/DEF%20CON%2025%20vot...