On the 40th anniversary of the passage of Roe v. Wade, a Pew poll finds just 29% think the landmark court case should be overturned, relatively unchanged in the past 20 years, but represents the lowest number in that time.

Almost two-thirds -- 63% -- believe it should not be overturned. (The numbers are basically the same between men and women.)

But just 62% of Americans even know that Roe v. Wade was about abortion.

Strikingly, less than half -- 44% -- of Millennials (those under 30) know the case dealt with abortion.