Mastio & Lawrence grade the 2020 Democratic debates: Kamala Harris at the head of the class by info@share.sv | Jun 28, 2019 | Political Mastio & Lawrence grade the 2020 Democratic debates: Kamala Harris at the head of the class From A (Harris and Booker) to F (Swalwell and O’Rourke), here’s how we graded the debate performances of Democrats vying to take on Donald Trump .