The 2018 midterm election will go down as the most expensive in US history.

The 2018 midterm election will go down as the most expensive in US history.

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The $5 billion election: How the 2018 midterms became the most expensive in history

The 2018 midterm election will go down as the most expensive in US history. A week out from Election Day, spending to influence congressional midterm elections already has surged to a record-smashing $4.7 billion, according to a new tally of activity by candidates, political parties and their outside allies.