Rabbi Michael Sommer's congregation has been "in a state of shock" ever since seven people were killed in a mass shooting during a July Fourth parade in Highland Park, Illinois. Sommer, the leader of the Har Shalom congregation, told ABC News that both he and the majority of his congregants are from Highland Park. The congregation meets in nearby Northbrook. Many of his congregants were at the suburb's Fourth of July parade where a shooter opened fire from a rooftop. "Everyone is in a state of grief. Everyone is looking how lucky they were to have their family safe… So...