Rep. Steny Hoyer (D-5th) talks about his support for Del. Adrian Boafo (D-Prince George's), right, after he cast his ballot during early voting at the Mechanicsville Volunteer Fire Department. Besides endorsements from prominent Democrats, Boafo has benefited from millions in outside spending, drawing fire from his opponents. (Photo by William J. Ford/Maryland Matters)In just the last two weeks, almost $4 million has been poured into Maryland’s …