Because he's a man and his wife loves and supports him.

Michelle's dedication to her husband is admirable (can we please stop perpetuating the stereotype that feminists hate men?); her responsibility as a mother essential (see #1); and as for her taking a "back seat," we're not convinced. Do you really think this Princeton/Harvard alum with her own track record as a community leader (as well as top-level executive) will not wield some kind of power in the White House? She's an extremely strong influence on her husband. She held a Harvard Law degree before he did. She mentored him when he joined Chicago law firm Sidley Austin, and she encouraged him to be a community organizer. Barack Obama listens when Michelle Obama speaks, and that's a pretty sweet deal for women.

It should be fun to watch feminist have fits as the Obama partnership exposes the feminist goal of gender equality for a sham.