The expenditure for political advertisements for the upcoming midterm elections will soon exceed US$1 billion, a new analysis revealed.

According to the report by the Wesleyan Media Project, almost US$918 million have been shelled out by the candidates and their supporters to show nearly 1.8 million advertisements for the senate, congress and gubernatorial races.

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Travis Ridout, a Washington State political analyst and the co-director of the media project, said that as the election day nears, the spending "will just keep on climbing" as the cost of airing the ads also surge.

The GOP will need six Senate seats to take the majority from Democrats. In addition, there are 36 gubernatorial slots open, in a race that the Cook Political Report called as a "tossup."

Denver, Colorado, is the top state where political advertisements are rampant, Ridout said. The state has a very competitive gubernatorial race, and has a tight race for the Senate and congressional race, he added.

The project's  researchers did not have a basis for comparing the expenditure for the year 2012 since there were only 11 gubernatorial seats open during that year.

Meanwhile, out of the 15 most competitive races for the Senate seats, Democrats have shown more advertisements in 10 of them, according to analysts.

In North Carolina, the top advertisement spots from September 26 to October 9 went to incumbent Democratic Senator Kay Hagan and opponent Thom Tillis of the Republican party, which had a total of 14,221 spots.

The sudden surge in campaign spending is because of the more active role of Independent groups in supporting their candidates, according to the study.

From the 32 percent commercials that were sponsored by independent groups in 2012 senate race, it has increased to 40 percent for the upcoming midterm elections this year.

TagsU.S. election, midterm elections, political ad spending, political ads, November elections