He's not on the ballot, but President Donald Trump looms large in races for state office in Maryland. (Photo by Tom Brenner/Getty Images)By Katelyn Winebrenner President Donald Trump stands at the center of everything in Washington these days — and as voters prepare to vote in Maryland’s primaries next week, he seems to be at the center there, too. State Senate President Bill Ferguson — a Democrat who hasn’t had a primary opponent since 2014 — i…