The recent election of Republican Dean Tran of Fitchburg to the Massachusetts state Senate was an embarrassing rebuke to the state’s top Democrats, including U.S. Sen. Elizabeth Warren. Despite their opposition, Tran defeated Democrat Susan Chalifoux Zephir, a Leominster city councilor who had the support of the state’s Democrat Party hierarchy, as well as Charlene DiCalogero of Berlin an unenrolled candidate Claire Freda.