Andrew Gillum wins Florida Democratic primary in upset against Rep. Gwen Graham

Tallahassee Mayor Andrew Gillum was not thought to be able to beat Rep. Gwen Graham in the Democratic gubernatorial primary, but he mastered a huge upset Tuesday.

Graham was in the lead toward the end of the counting, but not by enough before Broward County numbers came in, which was expected to be a Gillum stronghold. Once numbers poured in from the key county, Gillum surged to a powerful lead.

Gillum scored a major endorsement from Sen. Bernie Sanders (I-VT), who helped his campaign.