(Undated)  --  Almost half of unemployed Americans say they've given up on looking for work. 

A new poll from staffing firm Express Employment Professionals also shows about 50 percent of respondents blaming the economy for their problems finding employment. 

One in five blamed their last boss for their predicament, while more than a third considered themselves personally responsible.  The nation's jobless rate is at 6.3 percent, the lowest level in six years.