Opponents of Gov. J.B. Pritzker’s proposal for a multi-tiered income tax structure came out with a new argument Tuesday after the governor and Democratic leaders in the General Assembly unveiled their proposed language for a constitutional amendment. Under the proposed language, they argued, the state would actually be allowed to levy multiple income taxes, each for a different purpose, which would effectively allow the state to tax the same income multiple times. Supporters of the proposal say that’s not true. Still, the issue likely will be the source of heated debate...