To continue reading this premium story, you need to become a member. Click below to take advantage of an exclusive offer for new members: U.S. Sen. Richard Blumenthal, D-Conn., sits in the driver seat of a semi-autonomous Cadillac CT 6 in the garage at the Consumer Reports Auto Test Center in East Haddam before being given a ride to experience the Cadillac Super Cruise system on Tuesday, April 3, 2018.