He already had planned a visit to Iowa this weekend.
Democrats are targeting six congressional seats in Texas in 2020, primarily in suburban areas where O'Rourke did well.
And he finished the 3 1/2-minute video by saying, "The only way for us to live up to the promise of America is to give it our all and give it for all of us".
"Beto O'Rourke will have to define himself against a crowded field of Democratic candidates, but he doesn't feel the need to draw blood to define himself".
Unlike many of his opponents who launched campaigns while barely registering in public opinion polls, O'Rourke begins in sixth place in the RealClearPolitics average of polls, receiving an average of 5 percent.
After Cruz defeated O'Rourke, the former congressman revealed that he was mulling over running for president in 2020, despite repeatedly claiming that it was a "definitive no" regarding whether he would run or not.
The American and worldwide media jump up every time he makes a move and, unlike fellow Democratic candidates with far more experience, he was granted a cover interview with Vanity Fair and is...
US Rep. Beto O'Rourke, D-Texas, left, and US Sen. Republican critics frequently refer to him by his given name, a jab meant to underscore that he is not of Hispanic descent.
"I'm really proud of what El Paso did and what El Paso represents", O'Rourke said according to the station.More news: Browns Make Splash By Trading For WR Odell Beckham Jr
"Middle schools are one of the fastest-growing markets for marijuana sales today", O'Rourke said Thursday at a campaign event in Iowa.
After months of teasing a bid, he's finally, formally hoping to turn buzz from a close loss in Texas' 2018 Senate race into a White House try. If she chooses not to run or loses in the Senate or Democratic primary elections, AP reported Abrams could also be considered as a vice presidential running mate.
Building a national presidential operation, however, is a different matter.
O'Rourke enters the race with the presumed ability to raise huge sums online from small donors, as he did during his Senate run.
O'Rourke said he will hold a kick-off rally for his campaign on March 30 in El Paso, Texas.
He added: "You can probably tell that I want to run. I do".
"CBS This Morning" co-anchor Gayle King will speak with O'Rourke for his only national TV interview following his 2020 announcement, Friday on "CBS This Morning" with a preview airing on "CBS Evening News" Thursday night.