Obama and the Democratic Party together spent $105 million during the two weeks, while John McCain and Republicans spent just over $25 million.
In some markets, the Democrat is airing seven times as many commercials as McCain.
"It's beyond saturation," media analyst Evan Tracey told the Post.
While McCain took public financing for the general election, Obama opted out of the system, choosing instead to rely on his unprecedented fundraising operation.
The Republican National Committee can still raise money for McCain, though in the last two weeks alone, Obama outraised the RNC by $22 million.