David Trone knows what critics are saying about him. The 68-year-old Montgomery County businessman has heard the exhortations to step aside and let Angela Alsobrooks become the Democratic nominee for a rare open U.S. Senate seat in Maryland — setting her up to be the first Black woman to hold that office. He knows some voters wonder whether he, a moderate Democrat first elected to Congress in 2019 to represent a district that includes conservative Western Maryland, will stand up for abortion rights as strongly as a woman would — especially when Alsobrooks, a single mother, speaks of her daughter losing rights she holds dear.