Does my sign need a Paid For By disclaimer?
Regulations relating to campaign disclosures vary from state to state. We recommend that you check with your Secretary of State's office to find out if there are any disclaimer requirements in your state.
In the end - it may be better to be safe than sorry. You can always add a small disclaimer in the lower corner of your sign indicated who has paid for it. It can be small and unobtrusive and is easy to add in Design Central.