Don't bet on it. Your assuming Obama actually has some kind of ideological integrity. He doesn't, he's a political oppurtunist who loves the camera and is super ambitious.
More likely, he won't care, not bother understanding any issue (though this won't stop him from finding a camera, and speaking before it, i.e. see Shumer) and just voting in different and inconsistant ways so as to build some kind of centerist record.
My guess, He'll try and be the new John Breax or Frost or Ford. Sort of a consencus builder so as to gain popularity and keep the liberal label off of him. He doesn't care about results, or beliefs, he cares about his image and being a rising star. Not being a knee jerk liberal and acting more like a Biden or Lieberman or Breax sets him up great for a future run for the white house.
We shall see.
One thing is sure. Much like the old media was complicit in the JFKennedy "Camelot" fable, they have set their collective sights on him as one they will fawn over and publicize.
With the change in media consumption by many Americans to the internet, perhaps the Brinkley's of the world will have a harder time selling that pap.