A "Pension Promise" sign is seen as Illinois state union members and supporters rally in support for fair pension reform in the rotundra at the Illinois State Capitol Thursday, Jan. 3, 2013 in Springfield Ill. (AP Photo/Seth Perlman)
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A proposal to hand the state's future pension costs over to local school districts became such a sticking point that Gov. Pat Quinn and legislative leaders agreed to set it aside to try to get some movement toward a pension deal. But it could come back. A look at data from the Teachers' Retirement System shows why it's so controversial.