How can I include underscores in a footnote?

Question

Possible Duplicate:
Getting those %#!^& signs in the footnote!

I'm trying to do

\footnote{http://en.wikipedia.org/wiki/The_Wisdom_of_Crowds}

And it appears to be breaking because of the underscores

\footnote{http://en.wikipedia.org/wiki/TheWisdomofCrowds}

Seems fine. How can I fix this?

Answer 1

In the preamble:

 \usepackage{url}

and then:

\footnote{\url{http://en.wikipedia.org/wiki/The_Wisdom_of_Crowds}}

Answer 2

The url package as suggested in another answer is the preferred method. However, for the sake of completeness, another way to do this is to replace each instance of _ with \_. The fixed footnote is \footnote{http://en.wikipedia.org/wiki/The\_Wisdom\_of\_Crowds}.