As far as I know, an LDS President has never said "follow me by virtue of my authority," however nearly all of the lower ranking authorities unceasingly teach us this. This has implications because by the authority of the president, they have their callings and expect men to follow them by virtue of the authority they claim for someone else, otherwise, these authorities teach, we are "out if harmony." If this be the case, then have they not forfeited their authority? And have we any further obligation to follow?
"No power or influence can or ought to be maintained by virtue of the priesthood...[otherwise] Amen to the priesthood or the authority of that man." (D&C 121:41, 37)