The fact is that he’s not been challenged.
He was terrible at debate during the 2008 primaries. He was messiah like only when he was scripted on his teleprompter and added the reverb to the mics, and he phoned in his time in the IL legislature/Senate.
Couple that with the Chicago thugs, and their shabby treatment of Hillary!, and you have the makings of an emperor who has no clothes.
There is no way he can learn to debate effectively between now and the election.
No way at all.