Contributions come at a critical period for Villaraigosa's campaign, as he vies to come out ahead of Republican contenders in the June 5 primary.
Backers envision a pipeline for poor kids to attend Caltech; opponents want to know who's behind it.
The Broad Foundation announces its latest plan for creating "high-quality" schools.
The goal is "replicating schools that are working well," director says.
Los Angeles Unified deficit could reach $600 million by 2019-2020.