PHILADELPHIA — Pennsylvania Democrats are pointing to this week’s victory for abortion rights in Kansas as a harbinger for the Keystone State, where a similar ballot question could be considered by voters as early as next year. The proposed constitutional amendment in Kansas that would have eliminated a state constitutional right to the procedure generated unusually strong turnout for an August primary election — and the resounding rejection of it showed that abortion is a motivating issue, even in deep-red Kansas. And activists said it was an affirmation of public polling that has long showed…