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It sounds like you have a big site (# of URLs) so I'm going to side with the idea of adding the different campaigns.  I think I would do it that way for easier/better quality and tracking breakdowns.

Hi Ryan, Mirroring what Alan said, if the links are html text links - and they should be - then you will reduce your crawling problem with Google. If you must use javascript links, make sure to duplicate them using <noscript>tags so that Google will follow them.</p> <p><a href="http://support.google.com/webmasters/bin/answer.py?hl=en&answer=66355">http://support.google.com/webmasters/bin/answer.py?hl=en&answer=66355</a></p> <p>But be careful, Google doesn't treat <noscript> links like regular html links. At best, it's a poor alternative.</p> <p>Google derives so many signals from HTML links (anchor text, page rank, context, etc) that it's almost essential for a search engine friendly site to include them.</p> <p>The Beginners Guide to SEO has a relevant chapter on the basics of Search Engine Friendly Design and Development:</p> <p><a href="http://www.seomoz.org/beginners-guide-to-seo/basics-of-search-engine-friendly-design-and-development">http://www.seomoz.org/beginners-guide-to-seo/basics-of-search-engine-friendly-design-and-development</a></p> <p>Best of luck!</p></noscript>