The Tax Policy Center reports that the candidates' tax proposals would affect how much revenue the country collects:
Sen. Obama's tax proposals would raise $300 billion.
Sen. McCain's tax proposals would lose $1 trillion.
Source: Tax Policy Center: A Preliminary Analysis of the 2008 Candidates' Tax Plans: http://www.taxpolicycenter.org/publications/url.cfm?ID=411693
Photo Source: Project Vote Smart: http://www.votesmart.org/election_president.php