WASHINGTON (AP) — President Barack Obama's escalating military campaign in Iraq and Syria has drowned out the economic pitch he hoped would help salvage a midterm election that has been favoring Republicans. But the airstrikes against Islamic State extremists have also introduced a new complicating factor into the fall campaign, forcing both sides to reassess their closing political messages. Obama is drawing new attention to the nation's recovery from the Great Recession with a speech Thursday at Northwestern University, linking U.S.