GUILFORD — A contentious Republican Board of Education election centered on how race is taught in town schools resulted Tuesday in the highest primary turnout in years, an official said. The Republican newcomers who had received their party’s caucus endorsement solidified their positions on the November ballot Tuesday by sweeping the incumbents and two other candidates at the polls. Running under the slate name of “5 Reasons Why,” candidates Tim Chamberlain (1,275 votes), Nick Cusano (1,273), Aly Passarelli (1,273), Bill Maisano (1,269) and Danielle Scarpellino (1,265) earned the five Republican spots on the November ballot. Amy Sullivan (468), Joseph Golino...