Rahm Emanuel, in his most public comments to date about 2028, is confirming that he's considering a run for the next Democratic presidential nomination.The former Chicago mayor, White House chief of staff in former President Barack Obama's administration, and former congressman from Illinois said this week in an interview with Crain's Chicago Business that "I'm looking at the (Democratic) field, and most importantly, what I have to contribute.""I have been there," Emanuel added in an interview Thursday on CNN. "I have something I think I can offer. But I haven’t made that decision."Emanuel, who served as the U.S. ambassador to