CHICAGO (AP) — President Barack Obama is delivering an economic address Thursday at Northwestern University's Kellogg School of Management, a pitch the White House has long been planning to frame the midterm campaign's closing arguments. While Washington's attention was focused on a Secret Service scandal, Obama slipped away for an overnight trip to his family home in Chicago, just a short helicopter ride away from the speech site. The president has spent weeks consumed with international crises and wants to let voters know he hasn't forgotten about their financial struggles. Obama's challenge is to walk a delicate line between taking credit for an economic recovery without seeming to disregard continuing hard times. Obama aides also thought a scholarly business school audience would be the ideal setting for an address scheduled to last about 45 minutes and dive deeper into the economic issues than a typical campaign speech.