Two of the candidates running for U.S. Senate in Massachusetts debated Tuesday night — Democratic Congressman Seth Moulton and Republican attorney John Deaton. Incumbent Sen. Ed Markey skipped the event, leaving his rivals to argue about the economy, immigration, President Trump and about the man they want to replace. Deaton, a Republican who said he's never voted for Trump, sought to portray Moulton as a hyper-partisan Democrat, responsible for the dysfunction in Washington.