For all the talk about women’s issues in this year’s midterm election campaigns, something is missing. One of the most enduring labels of modern politics — pro-choice — has fallen from favor, a victim of changed times and generational preferences.That shift might seem surprising in this political season, when there has been a renewed focus on reproductive issues like access to abortion and birth control. Yet advocates say that the term pro-choice, which has for so long been closely identified with abortion, does not reflect the range of women’s health and economic issues now being debated.Nor, they add, does it speak to a new generation of young women, who tell pollsters that they reject political labels — not least one that dates back four decades, to the Supreme Court’s Roe v. Wade decision that established a constitutional right to abortion.“The labels we’ve always used about pro-choice and pro-life — they’re outdated and they don’t mean anything,” said Janet Colm, 62, president of Planned Parenthood Action Fund of Central North Carolina, as she prepared to take several younger women to a summer protest at the legislature in Raleigh. “I used to be a one-issue voter” — pro-choice — “but I think most younger people today aren’t.”No pithy phrase has replaced pro-choice. Activists talk mainly of “women’s health” and “economic security,” usually with policy specifics.“You just have to take more words,” said Dawn Laguens, the executive vice president of the political-advocacy arm of Planned Parenthood and an early proponent of a broader message.