There are many axes on which you can be liberal or conservative. He is President, not a judge, and his job is to lead the country. There's not much point in acknowledging Obama's security policies without mentioning his social, fiscal, environmental, and foreign policies.
Obama may be one things, but lying on a political spectrum neatly is not one of them. In fact, it's pretty damn hard finding a president who HAS been straightforwardly liberal or progressive, much less one that played well with the constitution. I'm not sure why you expect those two things to align.