There's no question that the Internet has provided an unparalleled medium for marketing the McCain and Obama campaigns. For one, anyone who is interested can easily go to JohnMcCain.com or BarackObama.com and see what the candidates want them to see. For those who don't know the URLs, a simple Google search for either candidate's name will bring you their official website at the top of the results.
John McCain Barack Obama
Even Search Engine Optimization has played a role in this race. Way back in January, Michael Jensen took a look at how the candidates were doing in terms of SEO. He looked at backlinks, Technorati links, Alexa rank, page strength, indexed pages, PPC branding, and IndexRank.