Unions are a cancer and should be treated as such.

(Rasmussen) — Half of American Adults (48%) think labor unions have outlasted their usefulness, but there’s a sharp difference of opinion between Republicans and Democrats on the question.

A new Rasmussen Reports national telephone survey finds that only 30% disagree and say that unions have not outlived their role. Twenty-one percent (21%) are not sure.

These findings are consistent with attitudes found two years ago. At that time, 45% said labor unions actually make America weaker, while 26% believed they make the country stronger and 13% said they have no impact.

Yet while 68% of Republicans and 54% of adults not affiliated with either of the major political parties believe unions have outlived their usefulness, 52% of Democrats still see a need for them.

Among working Americans who do not belong to a union, just 13% would like to join a labor union where they work. That’s up slightly from nine percent in March 2009.  Seventy-eight percent (78%) would not like to join a union.