This is by no means a complete list, but here are 10 techniques that we have seen for manipulating the vote.
Poll Oversampling - Over sample certain groups so that poll numbers skew. Example: getting responses from a higher percentage of democrats than republicans but sell the poll as "neutral" (leaving the exact way the pole was sampled in the fine print that most won't read).
Bandwidth Management - Leaking stories to the press or social media in such a way that those stories gain headlines while your opponent's stories are over shadowed. Releasing and holding material to disrupt your opponents narrative while giving your own narrative more momentum.
Fake Law Suits - People come out of the wood work and can claim all sorts of bad things were done to them right before an election. Funny how they were all silent until then.
Election Machine Hacking / Paper Ballot Losing and Stuffing - Funny how calibration almost errors always favor democrats. Also feel free to make it as easy as possible for large for large scale voter fraud to happen by not requiring ID checks to vote and do your best to get in friendly judges who will insist that although ID's are required for everything else under the son for voting they are not. Have your volunteers lose voter registrations of the oppositions and fill out ballots for the dead. Again this is a huge subtopic to be flushed out in another post.
Rings of Deniability - Make sure when you do something sketchy, always have a minion who either willingly or unwillingly will fall on their sword for the cause to take the blame. Example: When you are caught putting Craigslist adds out to recruit protesters, make sure a minion is the one who actually runs the add. When caught, make sure the minion will take all the blame and then dispose/fire the minion.
Astroturf - Pay and / or bus people in to disrupt rallies, fill vacant seats so low shows don't embarrass a candidate. Also use green screen technology to fill in non-existent crowds.
Manufactured Mom and Pop Signs - When your astroturfers show up, give them pre-made signs that look like they drew them up themselves.
Down Election Funding - While everyone's eyes are on the main candidates, make sure you legally or even illegally fund less interesting but just as important elections. Example: Soros funding democratic candidates in red states to go after State prosecutor and State Treasurer positions. These elections are not as sexy but their ramifications are immense.
Gerrymandering - Beat the opposition before the race even beings by winning State positions that control how districts are drawn up. Use lawfare to challenge things when they don't suit your party's interest. Do your best to stack the Federal Election Commission and the DOJ with bureaucrats friendly to your redrawing efforts.
Control the Media - Use crony capitalism carrot on the stick / punishment threats to control the big social media companies if your side is in power. Do the same with traditional media (a whole other topic to be flushed out later).