SPRINGFIELD — One attorney called it “blatantly unconstitutional.” A lawmaker said the math doesn’t add up. And another said he would give it the benefit of the doubt. Such is the range of reactions regarding Gov. Bruce Rauner’s idea to overhaul the state’s public pension systems, which he called a top fiscal priority regardless of how the Illinois Supreme Court rules on a previous reform plan. Rauner’s proposal, highlighted early in his budget address to state lawmakers …