Voters across the country are heading to the polls today for a slew of key off-cycle races, including governor's races in New Jersey and Virginia and the New York City mayoral election.

For decades, Americans have relied on exit polls to illuminate the story of what happened on election night. By gathering opinions from voters largely after they’ve cast their ballots, exit polls fill in the details that our secret-ballot elections otherwise leave impossible to know.

Not all of CNN’s Election Night coverage will take place on its familiar cable network. The Warner Bros. Discovery-backed news outlet will make a play for younger, digital audiences with a “live cast” on its new subscription-based “All Access” streamer,

As a result, cable news will be paying special attention. The races will also serve as an important test run for a couple of cable news networks in transition. "This is the first