Proposition 21 has received a number of nice endorsements from newspapers around the state, including this recent one from the Bakersfield Californian:

Ballot-box budgeting is typically replete with land mines, but Prop. 21 will solve an ongoing problem in a long-term and meaningful way. The projected revenue will be sufficient enough to both build an inflation-proof trust fund and keep park facilities at a steady level of maintenance. Prop. 21 also removes state parks from budget negotiations so that legislators no longer need to agonize over which recreational programs must take the hit. It's a small price to pay to preserve and protect a vital part of California. Vote yes.