The Iowa Caucuses just wrapped up a few hours ago, and there's already calls of voter fraud. There is some confusion of what took place at the Polk County, Iowa Caucus.
On Reddit, the incident is explained in further detail.
"It was assumed by the chair, Drew Gentsch, that the voter difference was due to a few people that left the building before the second round began. The question is whether there were really 456 total people present for the second round of voting. That was not clear, as Clinton's team did not perform a recount of ALL of the Hillary supporters during the second round of voting."