By Kevin Young
Entertainment reporter, BBC News
Finding cash to fund TV commercials is "the only thing that matters in American politics now", former US Vice-President Al Gore has said.
Gore has branched out into TV and environmental campaigning
"The person who has the most money to run the most ads usually wins," he told the Edinburgh TV Festival.
It was "astonishing" that the average American devoted nearly five hours a day to TV viewing, he added.
And Mr Gore asserted the internet was making TV more accessible and letting people join a "multi-way conversation".
He called this an important move because people could find and distribute information, and then watch as it was judged by others in terms of quality.
Mr Gore has become an environmental campaigner, and is in Edinburgh partly to promote his film and book, An Inconvenient Truth, which address the climate change crisis.
He is also president of CurrentTV, a channel that champions the work of "amateur" programme-makers who may be making names for themselves online.
About 30% of his station's output originates in this way but that this was likely to increase in the future, he added.
On the subject of the expenditure of political parties, Mr Gore, a Democrat, said: "Two days ago, I was at an event helping to raise money for a candidate of my political party, running for governor in one of our most populous states.
"I asked the question of him: 'What percentage of your campaign budget, between now and election day in November, will be spent on television commercials?'
"The answer was 80%," he told an audience of several hundred media industry figures on the final day of the festival.
"In my country, the average American watches television for four hours and 39 minutes a day. Astonishing, really.
"That's why candidates spend 80% of their money on advertising campaigns."
TV commercials lasting 30 seconds were "not thoughtful statements of policy" but were "usually emotive" and "well-tested" on focus groups, he said.
And he claimed the power of modern advertising had led to the ability to create demand for products "artificially".
"Now you sometimes see, in extreme cases, advertising created before the product, and then the product is based on what looks as if it's going to succeed.
"That same phenomenon has now happened to democracy," he said, suggesting that too often, political parties made decisions based on reactions to their advertising campaigns.