From what I can tell, the Jennings poll only measured in the 13th district. If you read the article in the bradenton.com site, it's clear that all that was polled was the 13th district and that the Harris question was part of the poll, which had the 13th district congressional race as its main question.
It would make no sense to poll anyone outside the 13th district to answer the main question.
Jennings is a liberal and a longshot to win in a GOP district.
Why would anybody believe her Internla polling?
She only let it be known to get desperation Fundraising from the DNC.