Switched documented here.
Anecdotal evidence has emerged that some voters who had intended to back Carson changed their minds after hearing the news. And perhaps more significantly, a pile-on by Cruz’s opponents has kept the pressure on the Texas senator’s campaign.
In at least one case, the misinformation left its mark. Waterloo resident Becky Smith said she stepped into the George Washington Carver Academy to cast her first-ever vote in the Iowa caucuses for Carson. She registered onsite as a Republican, switching her affiliation as an independent, so she could cast her ballot. But a man helping distribute ballots - she didn’t know his name or campaign affiliation - said he had just heard that Carson was “suspending his campaign.”
http://www.freerepublic.com/focus/f-news/3393635/posts
And you prove my point. The number swayed is anecdotal and minuscule. I don’t claim there woas zero effect (heck, butterflies in Brazille affect me), just that this is a non-story.