What is a 'sheeple'?

I have read this a ton in the newspapers over the years... what does it mean?
Someone who likes to make love to sheep, hoping that an ewe (female sheep) will give birth to a interspecies love child
Someone who blindly follows a political ideology (Alinsky-ites in the 08 election)
A person who makes a living off farming sheep
Someone who wants to be a sheep
Select gender and age to cast your vote:
What is a 'sheeple'?
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