This shows the results of the latest Emerson College Poll on the U.S. Senate race in Texas. They questioned 781 likely Texas voters between October 28th and 30th, and the poll has a 3.7 point margin of error.
Note that Cruz only has a 3 point lead among likely voters over O'Rourke. That is within the poll's margin of error. And if the likely voter model (based on past elections) is wrong due to the huge surge of voters this year, then the race could be even closer (or O'Rourke could be ahead).
This race is winnable! Make sure you go to vote!
