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"So, big tent, yes, if possible, but we do not give up our core values to accommodate some latecomers to the dance"
I'm with DZ on this one. Over time, Americans are actually becoming more socially/culturally liberal. Acceptance of gays, reproductive rights, racial integration, etc all increase as time goes by. Many kids raised in rightwing evangelical churches leave once they can make their own decisions about religion and spirituality.
It would be a big mistake for the Democratic party to change its stance on key issues to accommodate a set of values that is actually appealing to fewer people over the long term.