The most recent Emerson poll (October 30) showing Cruz at +3, and the latest Quinnipiac (October 28) showing +5, the RealClearPolitics average is giving Cruz a Cruz +6.8 over O'Rourke.
Polling showed Cruz - vying for his second term - consistently ahead, but by single digits.
Results: Texas polls close at 8 and 9 p.m. EST, or 7 and 8 Central (local) time.
The race was the most expensive in the U.S. Senate's history and the first to surpass $100 million in total fundraising. Republicans typically have a double-digit advantage over their Democratic counterparts in the deep red state.
O'Rourke had reminded voters of Cruz's original Trump moniker - "Lyin' Ted" - when the candidates last faced off against each other in late October. According to witnesses, O'Rourke, then in his mid-20s, "lost control of his auto and hit a truck, sending his vehicle careening across the center median into oncoming lanes".
In turn, Cruz garnered praise from President Trump, who referred to his former political rival as "Beautiful Ted" in the days ahead of the vote. "It's why the nickname stuck - because it's true".
Cruz picked up support in wide swaths of the Lone Star State, while O'Rourke carried urban areas like his home district of El Paso and progressive Austin.
However, O'Rourke ran his campaign with the assumption that pollsters and political operatives have been wrong about Texas. His statewide campaign galvanized voters in every Texas district, and he may well be credited with pulling a few Democratic representatives to victory.
Meanwhile, a comedy bit put the candidates in the national spotlight yet again.
Cruz then tried to make a joke about the Democrats taking Triumph to get fixed. "I support spaying and neutering", he says. That mind is none other than Triumph the Insult Comic Dog (and the man behind him, SNL vet Robert Smigel).