Now why would Michael Bloomberg be doing this:

New York City Mayor Michael Bloomberg has been receiving foreign policy briefing sessions on a wide variety of topics, providing the strongest indication yet that he is considering a run for the White House, the Huffington Post has learned.

The sessions, which were confirmed by multiple sources, have been conducted with Nancy Soderberg, a former U.S. Ambassador to the United Nations and a Clinton Administration foreign policy adviser. One source described her as "Bloomberg's Condi."

A range of topics have been discussed, from non-proliferation to the defense budget, with a specific focus on the war in Iraq.

That really does suggest that he's seriously contemplating a run. One other thing we can conclude from this, meanwhile, is that Bloomberg apparently doesn't share Rudy's view that having been Mayor of New York is adequate preparation for the manifold foreign policy challenges a President faces. He apparently thinks you should learn something about the topic first.