The Oasis cocktail, made in honor of the 2012 presidential election's swing states, is inspired by the notorious swing state Nevada. Try it at D.C. hot spot Artbar, at Art Smith's Art and Soul.
Place watermelon chunks into a Collins glass and set aside. Pour mezcal into a shaker. Add mint and lime, then muddle with mezcal. Add simple syrup and shake. Pour over watermelon chunks in Collins glass to serve.