CHICAGO — U.S. Rep. Jesus “Chuy” Garcia took two key steps toward announcing a campaign for Chicago mayor this week, amending his campaign committee to support a City Hall run and filing an economic disclosure statement as he continues weighing a challenge to Mayor Lori Lightfoot. The moves come after Garcia, D-Ill., conducted a poll that shows him beating Lightfoot, whose candidacy he supported in 2019. If Garcia gets into the race, his high name recognition and long record as a progressive could create significant hurdles for other candidates, but it’s not clear whether all the progressive u…