She's the ultimate professional woman. So you'd think Hillary Clinton's biggest source of support would be other alpha females. But as the New York senator's presidential campaign works to mobilize women executives, doctors and lawyers around America, it's getting a reality check: Many have resisted the call-up. So far, she's doing better among women of more modest means. Professional women are "much harder sells" than men. "They're tough." They are less inclined than men to see things in black and white, and seek more information before deciding, this adviser says. Events for businesswomen must be substantive, because they frequently ask...