CNN has performed an analysis of both candidates' tax proposals:
http://money.cnn.com/2008/06/11/news/economy/candidates_taxproposals_tpc/index.htm?cnn=yes
It's worth noting that almost 25% of the benefits of McCain's plan goes to the top 0.1% of wage earners. Obama's plan offers greater benefit to all those earning less than $100k.
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