Cruz was declared victor of the U.S. Senate race in Texas, defeating Beto O'Rourke.
But O'Rourke visited all 254 Texas counties and often drew larger-than-expected crowds, even in fiercely conservative areas.
Throughout the campaign, Cruz has assured voters that Texas is and will remain a conservative stronghold, frequently dismissing O'Rourke's media attention as hype.
The problem for O'Rourke was that he was running in Texas, a state that hasn't sent a Democrat to the U.S. Senate since 1988 and that Cruz won by 16 points in 2012.
"My confidence is in the people of Texas", O'Rourke told reporters on Monday night, moments before staging a raucous rally with Mariachi band at the University of Texas at El Paso, mere blocks from his home.
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The last time a Democrat won a statewide election in Texas was 1994.
Cruz is projected to win their close Senate race in Texas.
The race was the most expensive in the U.S. Senate's history and the first to surpass $100 million in total fundraising. We know that the hard-left right now, they're angry.
With the win, Cruz kept alive his hopes of mounting a second presidential run once Trump leaves the White House. Both said strong early voting statewide was a good sign for them.
Cruz argued that his opponent's support for gun control and universal health care were too liberal for Texas.