I don't know what the results are now, but to be fair, the "early results" don't always match the outcome. The selection of people being polled is essentially one demographic that's on at one hour, and the voters during the day have different values, opinions, and whatnot.
...And then I went and checked, and Nintendo's now at about 18.5%, so they actually went down.
The truth is, the only way Nintendo could win is by announcing a new Mario, Metroid, and Zelda game. Too bad they've forgotten about their hardcore audiences?
No, really, the true truth is that coverage of the showroom floor of E3 this year has been abysmal by most major media outlets in the gaming industry. Everyone watched those press conferences and made up their collective minds from that. Nintendo had a stronger position on the floor, offering things like Sin and Punishment 2, which wasn't hardly (or even?) mentioned in the press conference. Also, since people can't ignore things they don't like and focus on what they do enjoy, few feel like ignoring the biometric reader, rather than waiting until proper context is given.
Personally, I'd say Microsoft had the least interesting E3 showing, according to my own interests and tastes, but all three, from what I've seen and read, seemed to show a positive year ahead for video games.