Democratic Sen. Ben Cardin’s retirement has opened up a seat, and a potential battleground race, in Maryland. Prince George’s County Executive Angela Alsobrooks and Rep. David Trone are facing off for the Democratic nomination in an expensive race fueled by Trone’s personal fortune, but the campaign will not end there. Popular former Republican Gov. Larry Hogan jumped in late into the GOP primary with self-funder Robin Ficker, and polling shows Hogan would make the general election competitive in the normally blue state.