Carmen Brownlee (left) and Latonya Williams, parents of Chicago public school students, walk a picket line with striking teachers Tuesday. The teachers union said it had signed off on just six of 48 articles in the contract under negotiation. Issues in the bitter dispute include teacher evaluations and job security. (Associated Press)

Carmen Brownlee (left) and Latonya Williams, parents of Chicago public school students, walk a picket line with striking teachers Tuesday. The teachers union said it had signed off on just six of 48 articles in the contract under negotiation. Issues in the bitter dispute include teacher evaluations and job security. (Associated Press)