New York Magazine’s John Heilemann is leading a panel at the Web 2.0 Summit in San Francisco this morning on “The Web and Politics.” Joining him is San Francisco Mayor Gavin Newsom, Arianna Huffington and Joe Trippi.

The session jumped right off with Heilemann saying the Internet played a disruptive role in the 2008 election in the same way television played a disruptive role in the 1960 election of John F. Kennedy to president. Neither medium was new in the respective elections, but both “came of age” and swung the election towards the winning candidate. Kennedy, in particular, used television ads extensively in his campaign to reach the American voters directly.

Huffington says flat out that if it wasn’t for the Internet, Obama would not be president. Trippi notes that Obama’s YouTube spots gathered an aggregate of 14.5 million viewing hours. The Internet was used by candidate previously, he said, noting the Howard Dean campaign, but Obama really leveraged it fully with online video, blogging, social networking and fundraising.