The poor state of the economy, a lack of agreement among Obama's advisors and among Democrats, and the fact that deep pockets of conservatism and moderate ideology still thrive in the nation all lead to one thing: Obama's team has to prioritize and scale back some of the lofty campaign promises. This happens most of the time with new presidents, so it is not unique to Obama. Nevertheless, because a lot of his supporters are young supported him because they passionately wanted "change," the situation may differ for Obama than with other presidents.
Some younger liberals view Obama's election as a complete political realignment. Most political commentators have been more cautious in their outlook. And fiscal constraints would impact Obama's choices regardless of the nation's current ideological composition. I expect Obama to deliver some few specific items to the public (e.g., a stimulus package), in order to point to ways in which he has "changed" things. But I also expect him to continue discussing the fiscal constraints and to assert that change takes time. Apparently, this is what governing in prose looks like.