Munger doesn't believe two competing tax measures on November ballot would kill both

That would be Molly Munger, civil rights lawyer, daughter of Berkshire Hathaway Vice Chairman Charlie Munger, and the force behind a probable ballot measure that would raise more than $10 billion a year over 12 years. Munger's plan raises income taxes on a sliding scale for all but the poorest Californians. A competing tax plan from Gov. Brown increases the state sales tax and the personal income tax for wealthy Californians. Both are aimed at propping up the state's school system. From the FT:

Supporters of Mr Brown's proposal say two tax proposals on the ballot will harm the chances of both. Ms Munger disagrees: the two could appear side-by-side on November's ballot, she says, and still prevail. "Jerry Brown has called me twice," she says. "And neither time did he raise the idea that we shouldn't be doing what we're doing." What about her billionaire father? "My father is a Republican and it's unlikely that [new taxes] would have been his choice. But he's a very thoughtful person. He has never voted against any school bond or education initiative and he told me he isn't going to start now."

From Bloomberg:

Munger's plan would temporarily increase taxes on income of $7,316 or more, from 0.4 percent for the lowest earners to 2.2 percent for individuals making more than $2.5 million a year. It would raise $10 billion annually for 12 years. Under Munger's proposal, 30 percent of the added revenue would pay school-bond debt for the first four years. For the remaining eight years, all the money would go to education. Her campaign said May 7 that internal polling shows support for her measure is split 45 percent to 45 percent. A February survey by the Field Poll found that 48 percent opposed her plan while 45 percent support it.