In Bill Clinton's run for the presidency they used 'instant feedback' monitors to register audience likes and dislikes.

Bill was almost always liked-- he got high marks, no matter the subject. When the camera happened to include Hillary, the audience 'like factor' instantly plummeted. This is well documented in a book, I think it was George Stephanapolis's.

Some people can project likeability, some can't. It's not clear if it can be learned or not.