According to reports, the ad campaigns, which began in March this year, have seen Kerry and the Democrat party plough at least $250m in TV and radio advertising while Bush and the Republicans have spent $240m.
The Democrats have also had a greater edge over the Republicans when spending by outside groups is considered, with liberals spending $70m on airtime, compared with $40m by conservative organisations.
Evan Tracey, president of TNS Media Intelligence campaign media analysis group, said: "The story this year has been the sheer volume of ads. This is an election that I think changes politics."
The $600m worth of TV and radio ads ads have seen the candidates criticise each other's war records and continue to score points off each other over everything from justifying the war in Iraq to the way it has been managed.
In a recent ad, Bush and Kerry each enlisted the help of 9/11 widows to say why their country would be safer without the opposite party in power.
The US Presidential election takes place on Tuesday November 2, with the candidates running neck and neck in the latest polls, despite the intervention of terrorist Osama Bin Laden, who released a videotaped threat to the US at the weekend.
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