Scripture is replete with warnings about placing faith in political leaders above God.

God repeatedly calls the faithful to reject kings and idols, to disperse power away from any singular charismatic personality.  “Ye shall have no king nor ruler, for I [God] will be your king and watch over you.”  (D&C 38:21). 

Why?  Because we know from sad experience that as soon as men “get a little authority, they will immediately begin to exercise unrighteous dominion.”  (D&C 121:39).  Kings, with their greater authority, wreak greater unrighteousness.