The Internet has been moving to the mainstream of political life in the US for some years.
But in this presidential cycle it has been particularly important for the Obama campaign, which was starting from scratch with few resources and little name recognition.
The Internet favours the outsider, and gives them the ability to quickly mobilise supporters and money online.
And the more nimble use of the Internet by the Obama campaign in its early stages helped him overcome the huge initial lead of Hillary Clinton in the presidential nominating race.
Ready to go
Mr Obama’s Internet strategy was at the heart of his plan to win the Democratic nomination, according to expert Phil Noble, who tracks trends in relation to the Internet and politics.
When Senator Obama announced his campaign, his Internet site was already fully developed and ready to go – with a set of tools which allowed supporters to meet and organise as well as contribute money.
According to Michael Turk, the e-campaign director for the Bush-Cheney 2004 campaign, the Democrats had learned the lessons of 2004 very well in an “arms race” between rival teams of developers.
John Kerry depended on online fundraising in the 2004 campaign
Mr Noble says he expects Mr Obama to raise $1 billion online during the 2008 campaign, 12 times as much as John Kerry raised through online fundraising in 2004.