India, Nov. 3 -- Campaign advertising spending in the US has reached unprecedented levels ahead of the midterm elections, with Republicans leading the October spending surge amid growing concerns over losing control of both chambers of Congress.

According to AdImpact, Republican groups spent $1.9 billion on political ads in October, averaging more than $60 million a day. Democrats spent $1.76 billion, while independent groups accounted for another $350 million, taking total monthly expenditure to a record $4.01 billion.

The 2026 election cycle is now the most expensive in US history, with $11.2 billion already committed to advertising and future reservations. AdImpact estimates the final figure could reach $11.6 billion.

Several wealth...