I am using pathauto, but for some reason, Google News find my node pages. I have changed robots.txt to 'disallow /node/', but I really want to get to the root of the issue.

Here is an example:

http://nationalmortgageprofessional.com/news111/republicans-announce-com... (the alias that pathauto created)
http://www.nationalmortgageprofessional.com/node/12423 (what Google News finds with the search 'republicans announce comprehensive')

As you can image, my main fears are Google penalizing me for duplicate content and reduced SEO due to users linking to multiple versions.

Thank you in advance for your guidance.