LBJ used an ad similar to that against Barry Goldwater in 1968. This add actually ran only once but was so effective that it virtually ended Goldwater’s hopes. Of course LBJ’s ad used an innocent little girl counting “down” to zero as she set and plucked peddles off-of a daisy flower. At zero a nuclear bomb detonates in the background. It spoke to the fears that middle class Americans had (at that time) over the threat of Nuclear War and to Goldwater’s staunch, uncompromising right-wing POV’s and perceived willingness to use nuclear weapons.
Mitt, above, at best or at worst is just counting down to either a “dud” nomination or his own implosion.