This mormon site says that believe some of it.
“What Do Mormons Believe About The Bible?
Mormons believe the Bible to be the word of God. It was divinely inspired and written by prophets of God. It contains the gospel of Jesus Christ. The Bible is not the whole of the word of God. There have been other prophets in the history of the world and Mormons believe there are prophets today. Their words are also divinely inspired and never contradict the Bible. The Bible as it presently exists is a construction of the councils of men and has undergone countless transcriptions and several translations. Mormons believe that in the intervening 2,000 years the essential gospel remained but several finer points of doctrine have been altered or omitted on occasion and interpreted to suit the desires of those in power. Mormons believe that the Joseph Smith Translation of the Bible restored these changes and is a more correct version than any other. Mormons also believe in divine scripture in addition to the Bible. In the Mormon canon are the Bible, the Book of Mormon, the Doctrine and Covenants, and the Pearl of Great Price.”
http://www.dearelder.com/index/inc_name/Mormon/title2/What_Do_Mormons_Believe
And we say this with a straight face!
--MormonDude(We got MORE scripture than YOU do!)