ABC, CBS and NBC said this afternoon they will interrupt regularly scheduled programming tomorrow afternoon to join the cable news networks in carrying live President Obama’s remarks on the 50th anniversary of the historic March on Washington, at which Martin Luther King Jr delivered his famous “I Have A Dream” speech. At approximately 2:40 PM ET, NBC anchor Lester Holt and White House Correspondent Chuck Todd will anchor that network’s coverage of Obama’s remarks. At CBS, evening news anchor/managing editor Scott Pelley will lead that network’s coverage of Obama’s speech from the Lincoln Memorial. When Obama speaks from the steps of the Lincoln Memorial, ABC News’ Chief National correspondent  Byron Pitts will lead that network’s coverage.

CNN and MSNBC say they will telecast King’s 1963 speech in its entirety. CNN says it will run some time after noon ET (UPDATE: CNN said Wednesday it will air the speech in the 1 PM hour); MSNBC says it will run the speech at approximately 4 PM ET, after Obama’s remarks. MSNBC will repeat the speech, with limited commercial interruptions, during a Chris Hayes-hosted special, All In at 8 PM ET live from Washington.