I've been arguing the same thing for years.
Imagine, that someone who wanted to change an election could potentially pay 1000 people to illegally register, somehow pass through the election commission checks, and go out and vote. That might possibly sway a small local election. Or maybe someone could pay 1000 people to find names of legally registered voters, find their address, find their district, get to the district before the legally registered voter votes, fradulently sign the voting record ahead of the proper voter, and vote (assuming you convinced all 1000 to vote for the person you wanted), and do this in a tight election in the proper districts that actually make a difference. Again that might sway a small local election but rarely any election of any importance. It is just laughable to think that this ever has any impact. Why would anyone choose that very difficult route involving so much coordination, so much effort, so much money, and so many people that it will be highly likely that someone could blow the whistle? Sure there will always be a fradulent vote here or there, but they never amount to anything important.
Alternatively, a single person, with no coordination, almost no cost, or almost no effort at all could "lose" a few ballot boxes from your oppoent's heavier support areas and win.
Or stuff a ballot box or two. Or change one Diebold line of code. Or bribe one supreme court justice.
It is so laughably easy to falsely win an election from this inside and so nearly impossible to do it by voter fraud on the outside.
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