The vote will offer clues about how well U.S. Representative Kendrick Meek, seen here, can turn out black and Hispanic voters in the general election. Photographer: Joe Raedle/Getty Images

U.S. Representative Kendrick Meek is heading for a three-way Senate race in Florida in November with Republican Marco Rubio and Governor Charlie Crist, who's running as an independent. First, Democrat Meek has to get past a billionaire real estate investor in his party's primary.

The state's Democrats today will choose between Meek, a black lawmaker from Miami, and developer Jeff Greene, whose parties aboard his 145-foot yacht, "Summerwind,"� and friendships with boxer Mike Tyson and convicted Hollywood madam Heidi Fleiss have been a focus of campaign news...