So my argument for answer choice E is that E has to do with whether those who are committed will actually vote for a candidate after seeing them lose, while the premise deals only with, "whom they support." Support while viewing a debate is not necessarily consistent with securing a vote when the time comes.

I understand that the more glaring flaw of the argument is that it does not address those who did not view the debate, and in both timed and Blind Review I was down to B and E and settled on E both times.

Does anyone have a good explanation for why E has to be wrong?