TALLAHASSEE, Fla. — Florida’s acrimonious U.S. Senate contest is headed to a legally required hand recount after an initial review by ballot-counting machines showed Republican Gov. Rick Scott and Democratic Sen. Bill Nelson separated by fewer than 13,000 votes. The contest for governor between Republican Ron DeSantis and Democrat Andrew Gillum appeared all but over Thursday, with a machine recount showing DeSantis with a large enough advantage over Gillum to avoid a hand recount in that race. Gillum, who conceded on Election Night only to retract his concession later, said in a statement that “it is not over until every legally casted vote is counted.” The recount has been fraught with problems.