Chicago Teachers Union President Karen Lewis has emerged as Mayor Rahm Emanuel's chief antagonist — and as a possible challenger in next year's mayoral election. Yet the bitter rivals have striking similarities. In 2012, Lewis told Chicago magazine: "We should be best friends. We have way more in common than we don't." Some examples:
1. They're graduates of highly regarded Eastern colleges.
Emanuel: Sarah Lawrence College, class of 1981.
Lewis: The only African-American woman in Dartmouth College's class of 1974.
2. Doctoring runs in the family.
Emanuel: His father was a pediatrician at Michael Reese...