President Obama will deliver the 92nd State of the Union address at 9 p.m. Tuesday.

Watch Ed O'Keefe's "Edsplainer" video on who attends the State of the Union, and get all the details about how to follow along with Obama's speech -- and the reaction -- after the jump.

Where can I watch? 

Every major broadcast and cable news network will carry the address, and most of them will carry the Republican and tea party responses to it. You can also watch from any computer from the washingtonpost.com home page, or watch from your mobile device on our State of the Union grid (we'll link to it here and on washingtonpost.com when it goes live at 7 p.m. ET.)

Who is delivering the response? 

Each year, the party that does not hold the White House chooses someone to give the party's official response live on TV after the president speaks. This year the GOP response will be given by Sen. Marco Rubio (R-Fla.). In recent years, there also has been a "tea party" response from a prominent figure selected by the Tea Party Express. Sen. Rand Paul (R-Ky.) will give the tea party response after Rubio's remarks, which you can also watch on our homepage.

See our highlight reel from recent State of the Union responses here.

How do I follow it on social media? 

We're live-blogging all the action here on Post Politics throughout the day. The Grid we mentioned above will feature the best tweets, Instagrams and blog headlines when it goes live at 7 p.m. #SOTU will be the most commonly used hashtag. Do you know of a good way to follow it on another platform? Tweet me @ngjennings and we'll add it here.

While we're counting down the hours, you can tell the On Innovation blog what you think the State of the Union is in a tweet using #SOTweetU.