It's a game. the rules are here:
https://s3.amazonaws.com/cah/CAH_Rules.pdf
I'm personally playing the "god is dead" rule with my friends. I don't care about the US elections but this is a really fine game.
[edit] i know it's bad etiquette to comment on votes, but parent's question seems legitimate and can have usefull answers, it doesn't deserve downvotes imho.