Business How is middle class doing? Four gauges show why politicians are talking fixes.

Despite signs that the US economy is rebounding, the middle class continues to struggle. Politicians from both sides of the aisle have set their sights on boosting the middle class.

J. Scott Applewhite/AP

From President Obama to aspirants to succeed him, politicians seem to agree on one big theme these days: America’s middle class is hurting and in need of revival.