David Fleisher, in this LA Times oped on a this new report about exit polling about Prop. 8:

It’s true that the official election results — 52% to 48% — appeared quite close. But the truth is more complicated. The data we analyzed show that the No on 8 campaign benefitted from voter confusion.
Polling suggests that half a million people who opposed same-sex marriage mistakenly voted against the proposition. They were confused by the idea that a “no” vote was actually a vote for gay marriage. This “wrong-way voting” affected both sides, but overwhelmingly it helped the “no” side. Our analysis suggests that the division among California voters on same-sex marriage at the time of Proposition 8 was actually 54% to 46% — not so close. We are actually 1 million votes away from being able to reverse Proposition 8.

More in the report on pages 104-106.