By taking a stand on sex offenders, alternative energy, Schwarzenegger, challenger get message out, highlight differences. If Gov. Arnold Schwarzenegger has his druthers, Californians will vote in November to crack down on sex offenders, reject several taxes and authorize a raft of new borrowing for public works. If Treasurer Phil Angelides gets his way, voters will force oil companies to fund research into alternative energy, create a new system to publicly finance political campaigns and reject a new limit on abortion. The treasurer has endorsed initiatives that would raise tobacco taxes to fund health care, institute an oil extraction tax...