That sounds awesome... I just heard back from the Memphis group and here is what they had to say.
"Hi! My name is Jason, AKA webmaster for the area

I know I can speak
for our entire group when I say that we're ecstatic that you've been
inspired by our efforts. That and getting Ron Paul's name out in the
open were in fact our main goals. Anyways, to answer your questions,
we only had a few run-ins with the police, but being that they had no
clue that we were an organized group all across the city, the worst we
got was a slap on the wrist and told to take it back down. We had
actually spoken with a lawyer and a few cops before hand regarding
what the law was and what we generally got was that as long as we did
not impose danger to drivers (like blocking views or hanging them
directly over traffic such that falling could pose a danger) that
there was not much of anything against the law. Sure, some over
zealous neo-con cop could trump up some charge, but that was the
chance we took. It did not happen though, so it worked out well. That
said however, we did avoid some of the overly conservative suburbs
where the police were a little more guaranteed to cause problems, but
the city of Memphis I can promise has much larger problems than a few
political activists hanging banners. I'd be willing to bet the same
goes for Jacksonville, but I would recommend checking on that
beforehand.
Now all that said, a few recommendations should you try something
similar... The banners are very susceptible to wind (especially ones
hung from overpasses). Our best successes came from ones hung on
fences where all four corners could be fastened. Also, make sure that
you fold the tyvek one to two inches along the top and bottom before
putting in the grommets as this prevents them from tearing.For
locations where you'd be compelled to hang them by the top two
corners, I would also suggest that you insert something through the
bottom folds like a wooden dowel such that the corners cannot flap
independently as they very easily will.
And finally I reiterate, PLEASE be safe in whatever you do and be
careful not to inadvertently endanger traffic (as in any bridge
banners being hung over medians or emergency lanes

Other than safety
I wish you the best and look forward to hearing back about how it
goes. Make some good videos too as they always help to inspire others.
Feel free to let me know if you have any other questions.
Jason Williams"
I'm stoked!