Why Is the Mormon Church Secretive Of Their Primary Doctrines?

The spokesman of the Mormon Church Elder M. Russell Ballard is very careful to reveal the primary doctrines of his church to the public. I believe this is because it might affect the candidacy of Mitt Romney (a Mormon) who is running for the presidential race. Visit this site and check for yourselves: http://www.lds.org/ldsnewsroom/v/index.jsp?vgnextoid=3543487ded665110VgnVCM100000176f620aRCRD&vgnextchannel=9ae411154963d010VgnVCM1000004e94610aRCRD