"I'm not big on labels", O'Rourke told reporters in December when asked whether he could be considered a progressive.
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 joins a widening field of Democrats who have announced exploratory committees including Cory Booker, Jay Inslee, Pete Buttigieg, Julian Castro, former U.S. Rep John Delaney, Rep. Tulsi Gabbard, Senator Bernie Sanders, Senator Kirsten Gillibrand, John Hickenlooper, Senator Kamala Harris, Senator Elizabeth Warren, Bill Weld, Marianne Williamson, and entrepreneur Andrew Yang.
O'Rourke, whose given name is Robert Francis, acquired his nickname while growing up in El Paso, Texas.
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The cores come from Greenland and contain ice formed over the past 100,000 years. The study is published in the Proceedings of the National Academy of Sciences .
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It did not matter in the end, though, as Rennes failed to find a way through at the other end. Arsenal are in the Europa League quarter-finals after seeing off Rennes .
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To jump in on the mobile action Steam have announced their Steam Link Anywhere and have a supporting Android app ready. It goes without saying that the most crucial requirement for Steam Link Anywhere is a solid network connection.
O'Rourke planned to follow his announcement with a trip to Iowa, the state that will hold the first Democratic nominating contest in February 2020. He visited with students in the key swing state of Wisconsin.
His statement continued: "Beto O'Rourke failed to get anything done in Congress, and with extreme policies like government-run health care and tearing down border barriers, his 2020 bid won't be successful either". He said he "would not prejudge the outcome of that trial, ' adding:;All I am saying is, there's enough there'".
Newly official presidential candidate Beto O'Rourke says the November election may be the "best way" to determine President Trump's fate - a stance that softens his earlier call for impeachment to proceed.
Trump, who became known for slapping derisive nicknames onto opponents during the 2016 campaign, focused on O'Rourke's hands on Thursday when asked about O'Rourke's campaign announcement. I've never seen so much hand movement. "I've never seen so much hand movement I said, 'Is he insane or is that just the way he acts?'" Trump said during an Oval Office appearance with Ireland's prime minister.