Warren’s support has nearly doubled from 12 percent in July and is up from 18 percent in September. Support for Biden and Sanders has moved less than two points over that period. Buttigieg has gained five points since early September, a signal his national stature may be catching up to his standing in Iowa, where polls have found him rising and with double-digit support.
https://www.washingtonpost.com/politics/as-warren-and-buttigieg-rise-the-democratic-presidential-race-is-competitive-and-fluid-a-washington-post-abc-news-poll-finds/2019/11/02/4b7aca3c-fccd-11e9-8906-ab6b60de9124_story.html
