Although I agree that somebody needs to step in and save the US government, I don't believe that the LDS church is the one to do it.

However, a candidate for the governorship of Idaho is holding meetings to discuss the LDS prophecy that the US Constitution will “hang by a thread” and only be saved by LDS leadership.

See the newspaper article here.

For more information, see The Mormon Mirage 3rd Edition:  A Former Member Looks at the Mormon Church Today(Zondervan, 2009). Also available as an audiobook and as an expanded-text E-book for Nook, Kindle and other reading devices.