Josh Marshall points to the Great Texas Democratic Legislator Escape going on today as an example of what a filibuster should be:
Democrats are making a huge spectacle. No one’s going to miss that. They also have to be very clear why they’re doing it. It’s because of an assault on voting rights in the state. They have to own that. And they’re taking this step because they’re clearly quite willing to own that.
Just as clear, this can only go on for so long. How do I know? Basically logic really but also history. We’ve seen this in Texas, Oregon, Wisconsin and various other places. Legislators are only willing to stay on the lam for so long. Over time there are various tools legislative majorities can use to get their way. (That’s not a bad thing. Majority rule is our fundamental system.) You also need a really good reason for doing it. Otherwise public opinion will rapidly turn against you.
The whole effort is best seen as an effort to stall, buy some time and they hope either slow the process down or shift public opinion in their favor. It’s not pretty but there’s some value in having that kind of escape valve in the legislative process. It’s public. It’s self-limiting. You have to own it and be politically accountable for your actions.
In other words, the Texas Democrats didn't just send an email to halt all progress in the Texas Legislature. Imagine if US Senate Republicans had to do the same thing.