Independent Rob Sobhani, greeting Donna Walsh in Annapolis, and Republican Dan Bongino are confident of an upset in the race against Sen. Benjamin L. Cardin, though the Democrat has a healthy lead in polls. (Andrew Harnik/The Washington Times)

Independent Rob Sobhani, greeting Donna Walsh in Annapolis, and Republican Dan Bongino are confident of an upset in the race against Sen. Benjamin L. Cardin, though the Democrat has a healthy lead in polls. (Andrew Harnik/The Washington Times)