L.A.'s Richest: David Geffen

Hollywood mogul David Geffen's (#4) $1.2 million in giving since 1980 has mostly benefited the Democrats. He's a strong supporter of Sen. Barack Obama (although he also kicked in a little money last year for the presidential campaigns of Sens. Christopher J. Dodd and John Edwards

Worth: $4.8 billion

How he made it: Entertainment

Where he lives: Malibu