Employees at a Starbucks in Hopewell have voted to unionize, following the launch of their unionization effort in January, as the first New Jersey Starbucks to do so. The employees at the Denow Road store in Mercer County voted unanimously — 15 to 0 — to join Workers United Monday. The National Labor Relations Board, which conducted the election, counted the mail-in ballots at 10 a.m., according to Workers United. “This victory is a result of Hopewell baristas standing strong together after facing aggressive union busting by Starbucks,” Sara Mughal, a barista and member of the organizing commi…