Her campaign has, to date, done a really good job of brushing off his trash talk and not taking the bait... (Her responses to his comments about her ethnicity is Exhibit A).
Tonight will be a test to execute it with him a few feet away... Voters want to learn more about her, they don't want to see her responding to him. It may be inevitable at certain junctures, but she has to play her game, not get sucked into his
If she does that, she stands a good chance of a clear win... but easier said than done