I found this table from Ballotpedia rather interesting. It shows how much money has been donated to each side of the California ballot propositions.
| Proposition | Donations in favor | Donations against |
|---|---|---|
| Proposition 30 | $67,100,000 | $53,400,000 |
| Proposition 31 | $4,400,000 | $573,700 |
| Proposition 32 | $60,500,000 | $73,300,000 |
| Proposition 33 | $17,100,000 | $275,700 |
| Proposition 34 | $7,400,000 | $391,900 |
| Proposition 35 | $3,700,000 | $0 |
| Proposition 36 | $2,700,000 | $119,900 |
| Proposition 37 | $8,700,000 | $45,600,000 |
| Proposition 38 | $47,800,000 | $42,300 |
| Proposition 39 | $31,400,000 | $45,000 |
| Proposition 40 | $601,100 | $2,300,000 |