[donutz]

It's definitely open to coercion and intimidation, so in some respects I'd consider that a "major" flaw. But is it a widespread enough problem to rule out the paper ballot? Is there a systemic problem of spouses voting for differently-minded spouses, or employers requiring their employees to turn in their blank ballots, or things like that?

[jcranmer]

The rate of voting fraud for in-person voting in the US seems to be around 1 per 10 million votes cast or so. The rate for voting fraud for vote-by-mail seems to be around 1 per 100,000 or so.

In terms of invalidated votes, in-person seems to have about 1% of ballot rejections, whereas vote-by-mail has about 2% rejections. (No data on how many of those rejections were inappropriate and how many were appropriate that I could find). Citation: http://www.nytimes.com/2012/10/07/us/politics/as-more-vote-b...