The 'state' of Deseret was an attempt at a massive land grab by the Mormons. It would have given them the area in this pic inside the dotted line. The blue was the Utah territory. Deseret wouldn't have been a state. It would have been entirely independent of congress, essentially a Mormon nation.
Yep, they wanted that coastline of SoCal so they'd have a seaport.
No one ever said they were dumb, did they?