If you go by the federal poverty rate, the rate is 14%, which is about average for the US.
I'm not saying it wouldn't be hard raising a family on $68K here. I think it would be challenging, especially factoring in childcare, but the ALICE budget gives you $819/month for transportation. This seems excessive given you can get a $10k used car for about $228/month (I think). The pickings aren't amazing at that level, but I regularly drive a car that would currently be valued around $6-8k. It's safe and reliable. I haven't broken down other parts of the budget.
Statewide, the percent above ALICE threshold matches exactly that of California, at 57%, although there are slightly more in poverty (lower threshold than ALICE) in Texas: https://www.unitedforalice.org/national-overview
Is there data on what % of those are single earner households?