That all depends on how willing people are to accept a wrong vote from the machine.
I like my paper ballot ans single day voting just fine thank you.
There is even more insidious possibility. Even if the screen shows you are voting for Romney, inside the black box the vote is added to Obama. You can’t see it because it is not displayed on any screen.
That is why I am in favor of a paper record printed of each vote. The machine dispenses the printed paper to you, you look at it and then deposit it into a ballot box. Note that it is a computer generated paper ballot, and it will have none of the problems associated with hand marked ballots, in counting the votes through a scanner.
Now a permanent paper record exists for later verification in case problems or questions arise.
In Japan , each registered voter receives a paper in the mail from their local town hall / govt. When they go to vote , their name is checked off and they submit the paper . They then do a paper ballot vote . No problemo . Simple . You can’t vote twice . You can’t vote as an illegal alien . You can’t vote if you are dead . America is third world ???????????????????