Google co-founder Sergey Brin raises his total contribution to $45M for the Building a Better California Super PAC, which opposes a proposed 5% billionaire tax (Dara Kerr/The Guardian)

Dara Kerr / The Guardian: Google co-founder Sergey Brin raises his total contribution to $45M for the Building a Better California Super PAC, which opposes a proposed 5% billionaire tax — Sergey Brin gives $25m on top of $20m he's already given to Super Pac trying to block state's proposed 5% wealth tax