By Lisa de Moraes Updated with video: Stephen Colbert opened his very first Late Show by singing the National Anthem on a baseball diamond, in a bowling alley, on the Mall in Washington and elsewhere. At the end of the song, the umpire pulls off his face mask. “Play ball!” shouts Jon Stewart.
“Stephen! Stephen! Stephen!” The audience chant has followed him from Comedy Central to CBS.
He pronounced the first episode of “Late Show With/Starring Stephen Colbert” to be “TV history,” which…