Here's some edited video showing the crowd and the signs.
In the middle there is a prayer, and at the end is the national anthem. Once you get to the national anthem, it's all national anthem from there on. I decided not to edit that part down because you get a good view of the people who attended the rally and their attitude.
The prayer is quite interesting, including some discussion of what Jesus said to Peter after he cut off a man's ear. (Jesus didn't tell Peter to surrender his sword. He told him to "put it back in the holster." My Bible says "sheath," but Jesus wasn't speaking English.)
At 2:07, you see a sign that says "Political Power Grows Out of the Barrel of a Gun. Mao," held next to a second, matching sign that says — in between 2 peace signs — "Support and Defend the Constitution."
At 2:15, I'm talking to this man about his nice-looking but hard-to-stop-and-read sign:
He asks me if I recognize the face and (despite knowing I'm wrong) I guess Michael J. Fox. He lets me know it's Ayn Rand and I say I'll read it later (knowing I've got the still). It says: "The uncontested absurdities of today are the accepted slogans of tomorrow. They come to be accepted by degrees, by dint of constant pressure on one side and constant retreat on the other - until one day when they are suddenly declared to be the country's official ideology."
At 2:35, I talk to a counter-protester with a sign that says "Ban High Capacity Magazine Clips" and ask "What's a magazine clip?" She knew there was some question about that term, but she'd researched it on the internet and decided that was the term she wanted to use. Perhaps saying "magazine clip" is a way to signal which side you're on. A shibboleth.
ADDED: Other stills from the rally here.