When I was a kid my mother was fiercely private about her vote . She always told us it was rude to ask people who they were voting for.
It must be a generational thing, I have no problem talking with my kids about what we are voting for, who we are voting for and why. We have a 14 year old son and I feel that it's really important to get him involved in the civil process before he has to do it all on his own.
Whatever your beliefs, whatever your political leanings, it is so vitally important that you go out and vote today (or make sure your ballot is mailed in.) In a democracy we have the ability to let our government know what it is we want, what it is we stand for. When people don't vote that system doesn't serve us the way it should, and those who don't vote have no right to complain about it.
So go out there and stand up for what you believe in. Even if you don't talk to your kids about it in detail, even if they're too young to understand, you're setting the example of how to be a responsible citizen.