premise: The short-term shift in the political climate surrounding abortion reflects two factors that are likely to govern the debate in the next several months : the reawakening of the abortion-rights movement as a potent force after years of lassitude , and the ability of each side to counter the other 's advance in one arena with a victory of its own elsewhere .
hypothesis: The abortion-rights movement as a potent force caused the reawakenning to happen.