How to change your early vote

For the most of the country, once your vote is in, it's in -- and there's no going back.  But if you happen to live in one of a handful of states, even if you've sent your ballot in, there's still time to change your mind.

Seven states allow voters to re-do their ballots before Election Day.  The process and policies vary by state. 

For example, in Hawaii, Connecticut, and Minnesota, voters have until this Tuesday -- a week before the election-- to file a new absentee ballot.

In New York and Michigan, though, the deadline to request a new absentee ballot isn't until the day before the election.

And in Pennsylvania, you have all the way up until election day to decide if you want to change your mind, and can simply vote in person to replace your previous ballot.

If you keep changing your mind on who to vote for, then Wisconsin is the place to be. The Badger State allows voters to change their votes up to three times before the election.

In total, more than 1½ million Americans who've already voted could still decide to change their votes.

And while there's no way to track how many  ultimately decide to re-cast their ballots, researchers at the non-partisan Early Voting Information Center expect that number to be fairly low because early-voters tend to have stronger opinions and are far less likely to change their minds.

The polls are tightening in several of these key swing states, though, so in these last few days before the election, both candidates are chasing every vote they can get.