LOS ANGELES (AP) — Bernie Sanders’ political revolution — and how far he’s willing to take his presidential campaign — may hinge on the outcome of the California primary.

Hillary Clinton is poised to clinch the Democratic nomination in the coming days. But Sanders is showing few signs of surrender and he’s vowing to take his bid to the Philadelphia convention in July.

A Sanders victory in California Tuesday would be an embarrassment for Clinton. And it would embolden Sanders to more aggressively lobby superdelegates to switch their support to him.

Sanders is expected to return to his Vermont home on Wednesday and advisers say he intends to ramp up his courtship of the party’s superdelegates. He’s pointing to polls that show him faring better than Clinton in head-to-head matchups with Republican Donald Trump.

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