The deadline to register to vote is almost here. In Oregon, you've still got a few days. In Washington state, the deadline is today. But, hey, maybe it's not worth your time.
For all other states... google it. (replace "mystate" with your state, obviously, but leave the plus sign to force google to use your state in all links it finds. In other words, +california +Texas ...and so on and so forth)
...or don't. If, y'know... you're that sort of person.