Have to keep things optimistic.
I went to my first Republican Central Committee meeting tonight. Half these guys were Romney delegates. They would not take kindly to "Dump Romney" signs, hell they have a Romney snack vigil in the call center.
But when talking to several people on the executive committee they lock onto optimism and passion. Keep it happy and they are all for it.
Also they are extremely concerned with grassroots support issues. My local party is 300 volunteers behind the democrats.
It would be advantageous to make signs that say something like "the grassroots stand with paul." That will make since to them and let them see where these needed supported are hiding.