Everyone knows A/B testing is super helpful to eliminate guess work and increase conversions, little by little. Recently I read a case study by Dan Siroker (CEO of Optimizely) on how President Obama raised $60 million dollar by running a simple experiment. Dan was director of analytics on the 2008 Obama campaign when they decided to take full advantage of A/B testing to raise more money. They experimented with 2 parts of their sign up…