I'm curious if such is actually the case.
*Goes googling*
According to the
CIA World Factbook there are 307.2 milllion people in the US, according to
WikiAnswers* there is 6.3 million, which unless my math is wrong comes out to just over 2% (2.05%).
* I realize it would be more accurate to go to
LDS Newsroom and add up all the states (doesn't have US territories listed) but that's more work than I've got curiosity.