A volunteer receptionist answers a phone call at President Obama's re-election headquarters in Chicago. (PHOTO CREDIT: GETTY IMAGES) FROM CNN's Jack Cafferty: The continuing struggles of the U.S. economy are becoming a big problem for President Obama and his campaign for re-election in 2012. Economic reports show an unwelcome slowdown in what had been a … Continue reading How will the economy force Pres. Obama to change '12 campaign strategy?