I guess all those BYU students who went to South Carolina to help Mitt were about as successful in getting converts to Romney as they are to Mormonism. Hardly any Mormon missionaries ever successfully convert their prospects and many go home with serious doubts about Mormonisms after being confronted by knowledgable Christians.
A recent article I read said that almost 50% of returned LDS missionaries leave the LDS church after their mission.
I would not be surprised. After 2 years, it either turns you into ‘Norman Mormon’ or it makes you no longer believe it.
Here is one guy who became a Born Again Christian on his LDS mission and then got sent home from his LDS mission with only 3 weeks to go because he bore his testimony and didn’t mention Joseph Smith, the Book of Mormon or the LDS church - just Jesus Christ and salvation by grace. For that, he was punished.
http://www.youtube.com/watch?v=OlSxIxp7KPo