"Veronica Mars" won in 2004 with more than 50% of the 686,323 votes.

"Angel" won in 2003 with 85% and got another season!

Here some info from Kristin Veitch at E!Online :

Please keep in mind that you should base your vote not only on how much you love each show, but how likely it is to be canceled. The following shows all have not yet been picked up for next season and are divided by how likely it is they will survive.

ENDANGERED SERIES

Likely to Be Saved: George Lopez, Gilmore Girls, The New Adventures of Old Christine, The O.C., Reba, Scrubs, Smallville [James Marsters], Veronica Mars [Charisma Carpenter] and The Unit.

On the Fence: According to Jim, Close to Home [Christian Kane], Commander in Chief, Conviction [J. August Richards], E-Ring, Everwood, The Evidence, Freddie [Freddie Prinze, Jr.], Girlfriends, Hope & Faith, In Justice, Invasion, Out of Practice, Sons & Daughters, Supernatural, Teachers, The War at Home and What About Brian.

Likely Doomed: All of Us, The Bedford Diaries, Courting Alex, Cuts, Eve, Free Ride, Half & Half, Joey, Less Than Perfect, Living with Fran, The Loop, Love, Inc., Modern Men, One on One, One Tree Hill, Pepper Dennis, Related, Rodney, Surface and Twins.

As you may know, this SOS campaign has had a pretty solid track record over the years (four of the five winning shows were saved for at least another season, including Roswell, Once and Again, Angel and Veronica Mars), so this poll really can make a difference. Don’t forget to email me your one show (I know, it’s a tough call). And then email this link to everyone you know and get them on board, because there really is strength in numbers.

Click on the link to vote :

tvdiva@eonline.com