President Obama is a mystery. His enemies have never stopped claiming that he is secretly a Muslim and ineligible for the office of president because of his supposed foreign birth. His approval ratings are in the basement. In response he travels to Indonesia for what he says is a kind of homecoming. He gives speeches there about his outreach to Muslims and visits a mosque. How did this man become president? He seems to lack any real "feel" for the political process in the US. He seems to want to be a statesman rather than a politicianI share Pat's puzzlement. There are any number of excellent evaluations of the mechanics and strategy of how Obama became president - see myiq2xu's post today The Obama Movement on Confluence - all of which are open for analysis.
What Lang points at is a variation on the how. Why did this person who does not appear to have a political bone in his body ever choose to pursue this office? It doesn't seem to be something he actually wants to do, laying the foundation for what has followed.
It is another facet of wanting to be a Democrat for a Day. He wanted to have the moment of attainment, and, that complete, now seems rather nonplused that he has to stick around and do something.