This is ridiculous. There is no need for any "secret" or underhanded meetings with mormon officials. Given the choice, mormons will support mormons without any influence or urging from leaders.
I suspect it's more about "rainmaking" campaign funds than motivating voters.
How do you know this to be true? Lots of Mormons in Nevada did not support or vote for Reid for the Senate and he's a Mormon (although a weird one, to be sure)..