Ted Cruz has narrowly won reelection against an historic challenge by Beto O'Rourke, who ran a staunchly progressive campaign that refused to appeal to moderates and Republicans in deep-red Texas.
O'Rourke's campaign drew support from various celebrity figures, including singer Beyoncé, National Basketball Association star LeBron James and country music legend Willie Nelson.
Even that was a shock for Cruz, who won 10-plus contests during the 2016 Republican presidential primary and has always been considered the most powerful and popular conservative in a state full of them.
MSNBC's Brian Williams later apologised for what was said, telling viewers that "we have no control over what it's in the concession speeches of various campaigns".
In 2016 Mr Cruz ran for the presidency, winning the first state to vote, Iowa, and going on to finish runner-up to Donald Trump in the race for the Republican nomination.
In 2016, Cruz ran for president in a crowded GOP primary.
"It's the time for choosing". In total, Cruz and O'Rourke raised more than $100 million.
He raked in donations from across the country and even set a new record for Senate campaign fundraising by collecting more than US$38 million in the three-month period from July through September alone.
Cruz is projected to win their close Senate race in Texas. We know that the hard-left right now, they're angry. "They're energised", Cruz said on Monday.
Cruz argued that his opponent's support for gun control and universal health care were too liberal for Texas. Republicans have held every statewide office in Texas since 1994, reports Refinery29.