The Texas poll which showed a close race between Beto and Ted was of eligible voters, not likely voters. In Texas the old white conservatives are by far the largest group of reliable voters. Beto's chance is slimmer than the news coverage makes it seem.
The 2018 election is going to be a turnout election. IF voter turnout is 20% the Democrats are going to lose everywhere. If the turnout is 50% that means that more new voters, younger people, and people in the middle go to the polls. If they can hit that 50% there will be a wave. The rest of the year watch the get out the vote drives kick in hard. IF, and I say IF Beto gets within the error bar, shit is going to get very serious everywhere. I just hope that the DNC can take a moment and remember that there are down-ticket races and overcome the damage that was done during Obama. I'm hopeful, but very cautious.