Eich never clarified his position (nor did he retract it nor apologize) so we have literally no idea what aspect of this he supported along with 52% of the population of California.
I'm sure you'll eventually have someone chime in here that the proposition was "misleading" and there were "disinformation campaigns" that resulted in this 52% figure, AKA "doesn't count, we know what the vote 'should have been'." People forget that Obama famously stated "marriage is between a man and a woman" in 2008 (was he lying to appeal to more voters? Possibly, but the fact is he said it). It was a very mainstream opinion at the time.
What does that matter? I would expect us to not care about a small minority doing something everyone else does. Not to actively legislate against their right to do it. If anything, this makes it more extreme.
And when you convince somebody with a lie, and they later find out you were lying, you've probably lost them forever. Not smart.