O'Rourke said he had reached "the emotional decision" about running after traveling across Texas for the past three months.
Cruz, a freshman Senator, looks to have an advantage in the race, being that it is in the state of Texas, a solid red state, versus a Democrat. "He plans to make his decision in the coming weeks". Rep. Beto O'Rourke (D) is set to challenge him, according to The Hill.
Par for the Democratic course, O'Rourke endorsed Hillary for President in 2016 and served as a superdelegate at the Democratic convention.
"It's no secret that Joaquin is heavily weighing a Senate run, and he will continue to have those discussions with his family, friends and supporters across Texas", Castro's political director, Matthew Jones, said in a statement Wednesday.
Cruz, 46, is a Tea Party-backed self-proclaimed constitutionalist, while O'Rourke, 44, is a business man with a background in the tech industry, who was a pretty decent punk rocker in his younger years.More news: Redskins LB Mason Foster tweets about Raiders move to Las Vegas
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"So you don't know until you do it", O'Rourke said.
Democratic Congressman Robert "Beto" O'Rourke plans a campaign announcement in El Paso tomorrow and sounds as if he's ready to challenge Republican Senator Ted Cruz for his Senate seat next year.
The El Paso native went on a cross-country, bi-partisan 1,600-mile road trip with fellow Texas Congressman, Republican Rep. Before he began working in Washington, he served as a member of the El Paso City Council from 2005-2011.
Cruz's reelection for office follows him losing the Republican nomination for president to Donald Trump a year ago. Will Hurd, R-Helotes, demonstrated a talent for winning positive notice and using social media to engage a large audience.
And while it's not yet clear what 2018 will bring, but the early months of the Trump presidency have been turbulent for the president and congressional Republicans, who last week admitted they couldn't get their party together to support a proposed overhaul of President Obama's signature health care bill.