A majority of the party's national and state candidates are anti-abortion and oppose elective abortion on religious or moral grounds. While many advocate exceptions in the case of incest, rape or the mother's life being at risk, in 2012 the party approved a platform advocating banning abortions without exception. There were not highly polarized differences between the Democratic Party and the Republican Party prior to the "Roe v. Wade" 1973 Supreme Court ruling (which made prohibitions on abortion rights unconstitutional), but after the Supreme Court ruling, opposition to abortion became an increasingly key national platform for the Republican Party. As a result, Evangelicals gravitated towards the Republican Party.