Ken Toltz, the Boulder Democrat and longtime gun-control advocate, announced Sunday he is suspending his campaign to replace U.S. Rep. Jared Polis because of a serious health situation in his immediate family, narrowing the field for what was in all likelihood his top rival in the race, Joe Neguse. Provided photoKen Toltz “It’s a very difficult decision, which is the right one,” Toltz said in a written statement.