Education advisor and an aide in charge of lobbying lawmakers step down following Schwarzenegger's reelection. SACRAMENTO — Two of Gov. Arnold Schwarzenegger's prominent aides are leaving the administration, the first in what is expected to be a string of departures as the governor, following his reelection victory last week, retools his staff. Schwarzenegger aides confirmed Wednesday that Alan D. Bersin, the governor's education advisor, is stepping down, as is Richard Costigan, a senior aide in charge of pushing the governor's agenda through the Legislature. Costigan, who also advises Schwarzenegger on which bills to sign or veto, is taking a job...