"Polarization of the national parties over abortion did not appear at the time of Roe but took shape years after. While party platforms began to diverge on abortion in the 1970s, it took years after Roe for Republicans to vote more consistently against abortion than Democrats, a shift that seems to have begun with party leaders and then spread to its base. Greg Adams, examining abortion-related votes in Congress from 1973 through 1994 as a measure of the abortion views of the political system’s elites, concluded that it was not until 1979 (perhaps not coincidentally, at the same time Weyrich and Viguerie organized pro-life PACs) that congressional Republicans began to vote against abortion at a higher rate than Democrats in Congress."