Agree here. Ann Richards ran and won on 2 issues the first time, installing a lottery and insurance reform, which benefitted all Texans who owned a house or car. Most of the down ballot candidates have latched on to a few key issues, like Collier and Fix the Damn Grid.
The Beto camp is pretty sophisticated in how they set up both phone banks and block walks. Like gmr said, you have a pretty good idea who is going to answer and their leanings. They've also branched out into adding teams that specialize in persuasion work for fence sitters, as well as teams that reach out to the traditional non-voters. Plus they have a pretty extensive postcard writing campaign in full swing. They do really good training as well. They don't just hand you a lot of literature and point out a neighborhood, or hand you a list of numbers. But they do have their own way of doing things and expect you to follow them and show up.
https://map.betoorourke.com/