This year’s midterm election is already the most expensive ever, with the total raised by House candidates nationwide surpassing $1 billion weeks before the Nov. 6 election. In California, with at least seven tightly contested races that could decide control of the House, Democrats seeking to win seats in areas long held by Republicans are raising staggering amounts of money.

In those seven races, Democrats raised $21.6 million over the last three months ending Sept. 30; Republicans took in just $4.2 million in aggregate.

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