# Consolidating google results for 2 domains with the same content

I have 2 domains http://foo.com and a http://bar.com. http://bar.com is just a domain alias for http://foo.com so they have the same content. Results for both domains show up on google, I'd rather all google results point to http://foo.com. I've tried looking for this option in google webmaster tools but can't find it. How do I do this?

-