What you say is true with many LDS. But not so with Mitt.
When he was governor of MA, he ensured that funding of GLBT youth programs was continued. He promised the Log Cabin of MA that he would try to inject what was being done for sexually-confused youth (in those GLBT programs) into the national level.
So, while it's true (as you say) that he has spoken up for our values recently on inappropriate sex ed programs, he had ample opportunity to do the same thing re: programs for sexually-confused youth in GLBT programs in MA from 2002-2006. Did he do so? (No)
1. You will find that the GLBT funding and supporters have gone overwhelming to Rudy G.
2. The Episcopalians have gone over to promoting the gay lifestyle and ordaining gay bishops. Are they a cult too? :-)