A Dodd spokeswoman said the ad, which discusses Dodd's policies aimed at combating global warming, went up in the two states Thursday with a "moderate-sized" buy, The Hill reported Friday.
The spot also hails the senator's "courageous corporate carbon tax," which has been endorsed by some energy experts.
"All the Earth's creatures are threatened by global warming," the ad's narrator says. "One candidate for president is doing something to stop it."
The Dodd spokeswoman said the ad would run for at least a week.
Chipotle plans first price increase in 3 years
Justin Bieber crashes Drake Bell's album release party