Every country with an excessively "populist" head of state is in partial danger of the cults of personality that surround those figures, in my opinion. At an extreme level, the Communist dictators of the USSR come to mind; at a far more mild phase, heads of state that use their rhetorical abilities to influence audiences to agree with them without much independent thought on the part of those audiences are the norm.
The most "cultish" U.S. president in recent history is probably John Kennedy; his brief reign and assassination have left most people unaware of the interventionist campaigns he approved and engaged in during his brief administration. It's possible that he would have surpassed his essentially imperialist predecessor, Eisenhower.
Of the two most recent U.S. presidents with substantial cults of personality around them, Ronald Reagan and Barack Obama, which is the greater "deity" among their followers? This is perhaps not a completely fair poll, since we've seen eight years of Reagan and more than twenty years to reflect on his deeds, while less than two years of Obama's governance, though more of his public presence. But what would your analysis be, regardless? And yea, I'm expecting this to go along partisan lines.