Here’s a nice exclusive for PBS: President Barack Obama will present a message to the nation on the network’s A Capitol Fourth celebration. The statement will include congratulations to Sesame Street as it celebrates 40 years. The longtime fave Fourth of July show, this year featuring big names including Barry Manilow and Aretha Franklin, airs live from the Capitol from 8 to 9:30 p.m. Eastern on Saturday; check local listings.