Rep. Kathleen Rice Kathleen Maura RiceHillicon Valley: Simulated cyberattack success | New bill for election security funding | Amazon could be liable for defective products Lawmakers introduce bill to help election officials address cyber vulnerabilities House lawmakers to launch probe into DHS excluding NY from Trusted Traveler Program MORE (D-N.Y.) became the first lawmaker to endorse former Rep. Beto O'Rourke Beto O'RourkeJimmy Carter says his son smoked pot with Willie Nelson on White House roof O'Rourke endorses Kennedy for Senate: 'A champion for the values we're most proud of' 2020 Democrats do convention Zoom call MORE's (Texas) nascent presidential bid on Thursday, lauding the El Paso Democrat's ability to "rise above the toxic division in our politics."

"I’m proud to endorse my friend @BetoORourke for President!" Rice wrote on Twitter.

I’m proud to endorse my friend @BetoORourke for President!



He’s honest, authentic and has the courage of his convictions and a bold vision for our future. Most importantly, he'll build a movement that will rise above the toxic division in our politics and unite this country. — Kathleen Rice (@KathleenRice) March 14, 2019

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The endorsement came hours after O'Rourke announced that he would seek the Democratic Party's presidential nomination in 2020, ending months of speculation about his political future.

In an early-morning announcement video, the former congressman cast his White House bid as an effort to "unite a very divided country" and signaled that he would make immigration, health care and climate change centerpieces of his campaign.

"The only way for us to live up to the promise of America is to give it our all and to give it for all of us," he said.

In announcing his candidacy on Thursday, O'Rourke became the second Texan to enter the 2020 race. Former Housing and Urban Development Secretary Julián Castro has been running for the Democratic nomination since December.

In an email on Thursday morning, shortly after O'Rourke's announcement, Castro's campaign touted a spate of endorsements from 30 Democratic officials in Texas, including two state senators, 17 state representatives and former Housing and Urban Development Secretary Henry Cisneros, a former mayor of San Antonio.

Whether O'Rourke can break through an already-crowded Democratic primary field remains to be seen.

O'Rourke garnered status as a rising political star last year during his Senate bid against Sen. Ted Cruz Rafael (Ted) Edward CruzTrump argues full Supreme Court needed to settle potential election disputes Press: Notorious RBG vs Notorious GOP The Hill's Morning Report - Sponsored by Facebook - Washington on edge amid SCOTUS vacancy MORE (R-Texas). While he ultimately lost that race, he performed better than many observers expected and showed himself to be an adept fundraiser, raking in more than $80 million for his campaign.

But unlike other presidential hopefuls, O'Rourke did little of the traditional legwork to prepare for a campaign. He traveled to Iowa on Thursday, marking his first trip to the crucial first-in-the-nation caucus state this year.