Complex sentence: Once Angelides won the nomination, most polls showed him behind Schwarzenegger (though not far behind), later into the campaign, many voters likely believed Schwarzenegger would be re-elected whether they voted for Angelides or not.
Split into simpler sentences: Once Angelides won the nomination, most polls showed him behind Schwarzenegger (though not far behind). Later into the campaign many voters likely believed Schwarzenegger would be re-elected whether they voted for Angelides or not.