Democrat Loranzo Sadun, aiming to oppose Mike McCaul as a write-in candidate in the 10th CD, has announced that his campaign has 500 verified signatures on their ballot access petition, which is enough to allow any write-in votes for him to be officially counted. They're going to keep at it for another two months, with a goal of 5000 sigs, but this is a good hurdle to have cleared. You can make a donation here if you want to help him out.