I can't claim to know much about him, other than he's Hispanic and the Dems are willing to confirm him. A bio and resume are found on this site:
http://www.usdoj.gov/olp/prado.htm I have been referring back to a site that had very lengthy commentary on the history of the various controversial (according to Senate Democrats) cases by nominee, but now I can't find it. It was something like judicialnominations.org, if you have an idea what I'm thinking of, please give me a URL. I've already tried google, with no success.
I'm just guessing that they like him bc he's not conservative or they don't view him as a threat or something like that.