It varies by state. [0][1] [0] http://redbluerichpoor.com/blog/2008/10/what-is-the-probability-your-vote-will-make-a-difference/ http://redbluerichpoor.com/blo

It varies by state. [0][1] [0] http://redbluerichpoor.com/blog/2008/10/what-is-the-probability-your-vote-will-make-a-difference/ http://redbluerichpoor.com/blog/2008/10/what-is-the-probabil... [1] http://www.stat.columbia.edu/~gelman/research/published/probdecisive2.pdf(pdf) http://www.stat.columbia.edu/~gelman/research/published/prob...