he made a quip about donald trump. listen to this moment. >> i'm in favor of vaccines. do them over a longer period of time. same amount. just in little sections. >> dr. carson. >> i think you will see a big impact on autism. >> dr. carson, you just heard his medical take. >> he's an okay doctor. but you know, the fact of the matter is, we have extremely well documented proof that there is no autism associated with vaccinations. >> jeff, that was a good moment for dr. carson. >> a great moment. he used humor. he came to life. there were moments you forgot he was on stage. doing things like that reminded you he is. i wanted more policy throughout the debate. more substance from ben carson.