We shouldn't ever take the threat of democrats lightly. They are evil, and if they ever get in office, they'll use fraud to stay in office. However, O'Rourke coming close to beating Cruz was an anomaly that can't be repeated.
First of all, nobody knew who O'Rourke was when he ran the first time. Es Paso is across about 600 miles of desert from the rest of the state. He ran on a totally fact free platform. His campaign was pickup trucks, Willie Nelson and Whataburger. As a side note on Willie Nelson, he's a left wing sleazeball, grew up about a half hour from where I live. He's a con artist, but all the good ole boys love Willie. He did concerts for Froncis. O'Rourke got a pickup and drove around the state. He based his sign on the Whataburger ketchup packet.
He spent more money than any other candidate in Senate history, nearly twice as much as Cruz. Despite his claims of "grassroots support," almost all his money came from California and New York.
You know how you usually have to buy yard signs for a candidate? Democrats went to the homes of all registered democrats and asked if they could put up Beto yard signs (no charge) and did this months before the election.
Cruz has never been extremely popular in Texas, and was badly damaged in his campaign against Trump. That's why the rats thought they could get an unknown in by taking some mouth breather and creating a campaign around his photo.
A more typical election was Greg Abbott's re-election to governor, where he won over the Democrat 56% to 43%, over a million votes.
About 57% of the Californians coming to Texas are voting Republican, but the Democrats that are coming are of the particularly vile California Nazi type.