He keeps bringing up this "issue":

The former president's intervention . . . raised the second, and largely unspoken, issue identified by my friend from the Clinton administration: the two-headed campaign and the prospect of a dual presidency. In his view, which I share, this is a prospect that will test the tolerance of the American people far more severely than the possibility of the first female president -- or, for that matter, the first black president. As my friend says, "there is nothing in American constitutional or political theory to account for the role of a former president, still energetic and active and full of ideas, occupying the White House with the current president."

As I understand Broder's theory, the prospect of former President Bill Clinton being again in the White House and likely being Hillary Clinton's chief advisor is a political problem for clinton and the Dems. Is the man insane? Have whatever opinion of the actual Bill Clinton Presidency, but you have to deal with the fact that Bill Clinton remains extremely popular and his Presidency remembered fondly. Broder is either a fool or a shill on this.