>> and trump sitting there trying to take it. he's sitting there and seething. you can kind of notice this is going too far. >> president trump disputes the theory this is the moment he decided to run. but a few weeks later he began using twitter to attack obama, and a barrage would follow. he tweeted the birther conspiracy more than 60 times before finally admitting the truth. but in 2012 it didn't seem to matter. barack obama easily won re-election. and the very next day about 27b in the afternoon, trump tried a new line. we have to make america great again. two people noticed. even today it has less than 1,500 likes. but that tweet would mark a turning point in american history. because what came next changed