Chicago’s progressive movement has long championed social justice interests, from good government advocates to labor rabble-rousers, police abolitionists and public education reformers. Now, Mayor Brandon Johnson hopes to shoehorn a wealthy new group into the fold: the Chicago Bears. During a long-awaited presentation at Soldier Field Wednesday, the mayor stood with the National Football League franchise’s CEO and President Kevin Warren to debut a nearly $5 billion proposal for a new stadium and lakefront redevelopment that would be half-funded by taxpayer dollars. With political allies from the Chicago Teachers Union — which has vociferously opposed prior publicly funded stadium projects — looking on at the Soldier Field extravaganza, Johnson then sought to tie the shiny architectural renderings of the glass-domed sports arena dominating the lakefront museum campus to his larger, left-leaning agenda. “Because of the public benefit,” Johnson said when asked how he will make a progressive case for the proposal.