You campaign in poetry but govern in prose. The poetry of campaigning is lofty, gauzy, full of possibility, a world where problems are solved just because we want them to be and opposition melts away before us. The prose of governing is messy and maddening, full of compromises and half-victories that leave a sour taste in one's mouth. Governing is specific where campaigning is usually vague.
His comment, which follows, is noteworthy because Davis is black and seconded President Obama’s nomination in 2008.