The event sponsored by Planned Parenthood Action Fund — the group’s political arm — was the first of the election season centered on abortion. It came on the sidelines of the South Carolina Democratic Party’s state convention, a pivotal gathering of the party faithful in the South’s first primary state. The candidates were united in decrying a series of tough, recent abortion restrictions approved by Republican-controlled legislatures around the country geared to ultimately provoke a Supreme Court case that could overturn the landmark Roe v. Wade decision.