Yes this happens every cycle. By next week most polls will have Trump with a lead.
Political Jui Jitsu, use an opponent perceived strength agianst them. When I roll in Jui Jitsu, I actually like a bigger stronger guy, I can use his size and his hubris against him. His bulk and over committing to a move is usually his undoing. My sensei is a 160lb black belt and he can submit anyone in my class in less than a minute, including other brown and black belts.