What was the winning combination of media and message for Barack Obama’s ’08 campaign e-mail sign up page? For this exercise, first pick your choices of media and messages from the examples laid out in my last column, “Obama’s ’08 Campaign: Using Data to Win” and then come back here to find out the results. It’s ok. I’ll wait. Dan Siroker, former deputy new media director, Obama Presidential Transition and founder of CarrotSticks and Spreadly, did a fabulous job in…