Democracy is about feelings, y'all, and not procedural regularity.
I mean: the law was dumb, as are Texas' filibuster rules. But:
1. The action of crowds attempting to hold up a vote might (depending on circumstances) be democratic, but it's also not even remotely liberal. (Imagine the sides being reversed, and see how you'd feel about it. If you'd feel exactly the opposite, it's not a good political model.)
2. Thinking that politics is good or right when you get the emotional rush of a victory is not good. The entire point of politics (and law) is that sometimes you lose, and that's okay, because you want the other side to respect the outcome when you win.