We know for sure he can act presidential and go on the attack with Hillary, we have seen him do it. The issue is whether Trump can stay disciplined and consistent through the election in November? His biggest weakness is rising for the bait when other people try to set him up. Michael Walsh's advice is spot on.
Don't kid yourself, if the election were today Trump would probably lose. But Trump can definitely win this thing. But it is going to take work to do it. Trump has to win over enough voters to defeat Hillary. Bombast alone will not do it--his attacks need to be smart and targeted.
So he lost George Will? Sorry, not voting for Trump or opting out is one thing (I may not vote for Trump myself), but #NeverTrumpers actively trying to defeat him for the benefit of Hillary Clinton is another thing all to gether.
Lem's Levity: Hillary and Obama have shown unexcused incompetence (Trump should focus on this).