Regarding Trump–
It's not unusual for a candidate to ascend quickly to the top, especially if there are many unknowns. When there is a vacuum people are quick to fill the void with whatever is out there. As soon as more is is learned about them, the chamber's content is expelled and await the next hopeful for the process to suck in. Much like the 2012 Republican campaign, I predict the rise and fall of several candidates before they settle in on one. My guess is that as soon as Trump's popularity wanes a bit, he will drop out. I don't think he likes to be out of the limelight. That's my prediction but I'm usually wrong.