To me this just proves that the American population is seriously fickle and has a short attention span. That's the only logical explanation why a President (and not just this one) can fluctuate so wildly over the course of a couple weeks based on single events.
Huntsman / Kasich 2020
Then: "Any child can grow up to be President."
Now: "Any child can be President."
First non-white president. Gave lots of people health care. Shifted thought to the Left. Gay marriage. Out of Iraq and Afghanistan. ACA. Unemployment down. In some circles he will be remembered as one of the all time greats