SACRAMENTO – A labor-backed coalition announced a signature-gathering drive yesterday for an initiative that would increase business property taxes by an estimated $2.8 billion a year to aid schools, transportation, local public safety and senior citizen tax relief. The drive, funded by the California Teachers Association and the California Correctional Peace Officers Association, is part of a scramble to ready measures for a possible special election this fall. Gov. Arnold Schwarzenegger, calling this the "year of reform," has business backing for four proposals that would control state spending, create new legislative and congressional districts, change public employee pensions and switch...