Here, ignoring Obama's Organizing for Action and the Deep State, which must be the point (oh look, a deer):
If this were a parliamentary democracy, there would be a leader of the opposition, and a whole “front bench” of opposition spokespeople, issue by issue ― a kind of Shadow Cabinet. ... Even better would be if a leading Democrat put herself forward now, as the presidential candidate for 2020. That way, there would be head-to-head comparisons and challenges, as well as almost equal coverage.