Kathy Castor is on Team Graham.

The Democratic congresswoman from Tampa announced at a brief press conference Friday that she would back her former congressional colleague, Gwen Graham, for governor.

"We need to look to a person who is going to support Floridians day in and day out," Castor said before an audience of a few dozen teachers, press and Graham family members.

Castor, who's running unopposed in 2018, cited Graham's stances on covering people with pre-existing health conditions, education funding and the environment as her reason for endorsing the daughter of former governor and U.S. Senator Bob Graham.

Read more: Where the 2018 candidates stand on the issues.

Graham, for her part, enthusiastically accepted Castor's endorsement. And she encouraged the assembled crowd to tell their friends to register to vote in the closed Aug. 28 primary.

"There has never been an election in Florida's history that has had more on the line," Graham said.

After her brief remarks, Graham answered questions from the press and from the teachers gathered at the Hillsborough Classroom Teachers Association in Tampa.

When asked about the recent controversial "stand your ground" case out of Clearwater, Graham said Pinellas County Sheriff  Bob Gualtieri acted "too quickly" in deciding not to charge the killer of Markeis McGlockton. (Read more about that case here.)

Recent polls have Graham atop the crowded Democratic primary field, which includes Andrew Gillum, Chris King, Jeff Greene and Chris King. But the race is still wide open: a large share of voters has yet to pick a candidate.