Obama isn't a hacker, but he appointed people who made our government more transparent by using technology. Opening government data up a little for hackers to play with - data.gov, usaspending.gov
Much of that is more token transparency. A better description IMO would be technology enhanced disemination facilitation seeing as much of the data was available previously only in a less readily available format or simply in a different location rather than a centralized repository. Obama isn't substantively more transparent overall