CHICAGO — A coalition of public unions attacked pension reform plans floated by Gov. Pat Quinn and lawmakers as unconstitutional and offered to increase their contributions if the state guarantees to annually fund its share needed to shore up the system.

The group — known as the We Are One Illinois coalition — said Wednesday the state could raise more funds to cover its own contributions by halting some corporate tax benefits and imposing a range of new taxes to generate $2 billion annually for pensions.

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