FOR months, our political punditry foresaw one, and only one, prospective gender contest looming in the general election: between the first serious female presidential candidate and the Republican male “warrior.” But those who were dreading a plebiscite on sexual politics shouldn’t celebrate just yet. Hillary Clinton may be out of the race, but a Barack Obama versus John McCain match-up still has the makings of an epic American gender showdown. The reason is a gender ethic that has guided American politics since the age of Andrew Jackson. The sentiment was succinctly expressed in a massive marble statue that stood on...