Political Machine: Bought the game, very fun and customizable. I managed to win with a Bernie Sanders running a conservative campaign once, or make Cruz win New York lol. The game is easy to learn and play in the first difficulty levels, but when it goes to hard it's a good challenge. Only bad thing is that there's no primaries, just general election off the start.
http://www.politicalmachine.com/President Forever: Only played the demo, but this game is VERY, VERY complex! Also lots of fun, and there's more endorsements to win than the first game, and winning states is very hard. The game starts in the primaries, which is a very cool thing. You can try the demo for free and see if you like the game. I've played with Hillary when I tried it out, the game is realistic enough, I was accused of corruption and shaddy deals almost every week lol.
http://270soft.com/us-election-games/president-election-game-2016/