I voted for Salma Hayek.
Erg, I mean, none of the options seemed right. I think you can "win" a campaign, by achieving some goal, and that that's "winning" in D&D. In this sense I think winning in D&D is important, and I share the sentiment regarding Midnight being "unwinnable" - I don't consider it possible to "win" a cannonic midnight campaign, the PC's actions can't amount to any significant victory over the Shadow. (Of course, in the Midnight campaign floating around in my head for the last few years a win is definitely possible, but it breaks the cannonic setting.)
Of course, once a campaign is over you can proceed to the next one, so there is never an ultimate win.
And in the sense of "every one has fun", everyone wins.
But that doesn't detract from the fact that for me a D&D campaign should, indeed, be "winnable" to be really fun.
A campaign where the PCs fail to beat the BBEG and so "lose" is quite like a long sports game where your team may have won some points, but ultimately lost to the other side. You can talk all you want about how "the point is to participate, not to win" or so on, but it still stings and casts a bitter shadow on all the game.
So yes, you can win and you can lose in D&D, IMO.