MSNBC has a story about how the governor of South Carolina and others are upset about these ads which appeared around the time of the Gay Pride festivities in the U.K. and elsewhere. A state tourism employee resigned over this. I doubt any gay people wanted to visit Civil War battlefields in South Carolina. There is also the language barrier because this turned off many junior high kids who read "South Carolina Is So Gay" and thought "South Carolina is boring stuff my parents would like."
Personally, I think Amro Worldwide should partner with Springfield Convention and Visitors Bureau. The posters can read "THEY DON'T CALL US THE QUEEN CITY FOR NOTHING!"