Some info and a short description of this South Park episode on South Park Zone:
South Park - Douche and T**d is episode 119 of South Park. It was originally broadcast on October 27, 2004, just before the 2004 presidential election.
In this South Park episode, Stan is forced to vote in an election for the school's new mascot because the old one is protested against by PETA. Disgusted with the electoral process, Stan refuses to vote. As a consequence, the school administration decides that Stan must be banished from South Park for eternity or at least until he decides that voting is important. He is chased away by the townspeople while his shirt is torn to pieces before being sent off into the woods.
South Park Spoiler Alert!
(The complete plot for this South Park Episode)
The episodes begins with a local PETA group that protests the use of a cow as their mascot for "the 47th time", during a pep rally at South Park Elementary. The school agrees to pick a new mascot, and the students are told to vote for a new mascot. Embarrassed by the bland choices, the kids decide to fill in a joke candidate but disagree as to whether it should be a "giant douche" or a "T. sandwich." Kyle rallies his friends to fill in the giant douche, and Cartman gathers support for the T. sandwich. he result is that the two joke candidates get the most votes and the students must choose between the two in an election. Stan is equally dismayed, wondering why anyone would care about such a pointless exercise. He talks about it with his parents at dinner, but his parents are not impressed with his apathy at all and even get into a fight over who should win when Stan explains who the two competitors are. This results in Kyle calling on Sean Combs (P. Diddy), who intimidates Stan with a literal Vote or Die campaign. Meanwhile the campaign continues, with the T. sandwich supporters rallying against the giant douche supporters, using bribes and fear mongering to gain support.By the time of the election, Stan agrees to vote after being chased by Combs and his associates through the streets with guns. However, he realizes Kyle only wanted him to vote in order for giant douche to win when he votes T. sandwich and Kyle demands that he change his vote. Disgusted with this electoral process, Stan once again refuses to vote. The school administration decides that Stan must be banished from the town for all eternity or until he decides that voting is important. He is spat on by the townspeople and his shirt is ripped off piece by piece before being placed on a horse, bound with a bucket over his head, and sent off into the woods.
Eventually he reaches the PETA encampment, where he finds that the people have grown weird with the animals . The head human member teach gives Stan what he needed this whole time, a proper reason why he should vote rather than 'because you have to'. They tell him that an election is always between the giant douche and a T. sandwich, because they're the only people who are bad enough to make it that far in politics, which Stan understands. P. Diddy shows up at the camp to eliminate Stan, but is distracted by a PETA member who throws a bucket of blood on his fur coat. This angers him, and he takes his rage out on the PETA camp eliminating all the members. Stan gets shot in the shoulder, but manages to escape and flee the camp.
Returning to South Park, Stan is finally convinced to vote and chooses the T. sandwich. Despite adding his vote to the tally, the giant douche still wins the vote 1410 to 36. Stan is initially dismayed that his vote didn't matter, but Randy informs his son that all votes matter even if it's for the losing side. Suddenly Mr. Garrison runs in with the news that the PETA members have been discovered dead. As a result, the cow is reinstated as South Park Elementary School's mascot. Randy tells Stan that now his vote didn't matter, much to his annoyance.
The credits are played to a takeoff of the Rock the Vote theme, suitably reworded:
Let's get out and vote!
Let's make our voices heard.
We've been given the right to choose,
between a douche and a T.
It’s democracy in action!
Put your freedom to the test.
A big fat T. or a stupid douche,
Which do you like best?