Amid an extraordinarily media-driven presidential campaign, the Internet has loomed large, influencing everything from fundraising to fact-checking.

Nielsen Online recently analyzed the online presidential campaign, examining online advertising by the candidates, Web traffic and online video viewing at both campaign’s sites, and blog buzz related to the election.

Online Advertising
Senator Barack Obama’s campaign ramped up its online advertising in mid-September. Image-based ad impressions by the Obama campaign grew 202% from September 15 to 22 — and by another 94% by September 29.

In mid-October, Obama’s campaign also stepped up its sponsored link advertising, surpassing McCain’s sponsored link advertising for the first time.

In contrast, Sen. McCain’s online advertising push came in the weeks just before the Republican National Convention. McCain boosted image-based ad impressions by 261% between August 11 and 22, but after announcing Palin as his running mate, scaled back his display advertising. Between August 25 and September 7, McCain’s image-based online advertising dropped by 85%.

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