Seven in 10 Americans believe Roe v. Wade should stand, according to new data from a Wall Street Journal/NBC News poll, as the landmark Supreme Court abortion-rights ruling turns 40 on Tuesday. It is the highest level of support for the decision since polls began tracking it in 1989, mostly the result of more Democrats backing the decision -- particularly Hispanics and African-Americans -- and a slight increase in support from Republicans. But the poll showed a consistent tension in Americans' attitude toward the ruling. Almost seven in 10 say there are at least some circumstances in which they don't support abortion. Thirty-one percent of respondents said abortion should always be legal, and 9 percent believed it should be illegal with no exceptions. Between those two opinions are the 23 percent who said it should be legal most of the time but with some exceptions, and the 35 percent who said it should be illegal except in circumstances of rape, incest and a threat to the mother's life.