I agree. I'd eat at Geno's every day to show support, but I live (unfortunately) on the Left Coast, and Geno's web site says they won't ship. Go figure. I'd buy a t-shirt if they sold them (and wrote to tell them so). I'd proudly wear it everywhere to tweak all the California libskis. Please take a moment to write them (http://www.genosteaks.com/contact.php) and urge them to make up t-shirts and sell them through their web site.
BTW, while you're there, check out the picture of Rosie O'Donnell in the "Celebrities" section. THAT was clearly taken a few cheese steaks ago!