Job Fact:  If you are a middle class worker your pay correlates to union membership.  Over the past 40 years union membership in the United States has steadily declined, and so has the share of middle class income.  An assault on unions is an assault on the middle class.

http://thinkprogress.org/economy/2011/01/20/173738/report-incomes/

http://www.americanprogressaction.org/issues/2009/02/efca_factsheets.html

Middle Class Pay Is Correlated With Union Membership.