America has fallen for the Obamas. The history, the high glamour, the PDAs on the White House lawn. It's a universal picture of love. But for many successful black women, with college degrees, ambitious careers and five-year plans, that enchantment has become something of an obsession. Those of us hoping to find suitable mates in a dating landscape that is, statistically speaking, pretty grave, are absolutely giddy about the very existence of the first family and especially about the possibility that we could find our own Barack.