Molly Munger has spent millions on an income tax hike to fund education. Charles Munger Jr. is helping fund a bid to bar unions from donating member dues to politicians. Both issues will be on the fall ballot.SACRAMENTO — In a second-floor walk-up near the Capitol, two children of one of the world's richest men used to slump into armchairs in the evening and gripe about California education, unwittingly laying the groundwork for a potential upheaval in state politics.