Beat them at their own game. Precise use of the English language.
He does get a little sloppy at times with his language, I agree. But so far it hasn’t hurt him. Most people seem to get the gist of what he’s saying and understand the off cuff nature of the comments. In the general election, when talking to a broader audience, it could potentially be a little more problematic, but so far he’s shown an ability to deal with it effectively.