Polls like this are always going to be favorable for the incumbent, and this case a third of the respondents still have "no opinion" on Warren.
Especially this early on. Also, to be more specific, 16% of people don't who she is, 18% have heard of her but don't have an opinion on her either way. Also this poll has 22% undecided (actually it's "Don't Know / No Opinion", but it means the same thing).
Edit: It seems kind of buried under a lot of other stuff, but this poll has Trump at 49% favorable to 46% unfavorable. Warren is at 37%-30%.
