Friends speculate that the post Mitchell really covets is commissioner of baseball. An avid fan, he’d earn $1 million or more a year, while flying around the country watching ball games. “It’s a whole guy thing,” says a female Senate aide. The senator, who is divorced, is also involved in a new relationship with a young woman. Friends say Mitchell enjoys his private life-and wants to keep it that way. Meanwhile, the White House has “broadened” its court search, says a senior official, a sign that Clinton is unhappy with the current list.