What's at stake in the US midterms on November 3, in numbers
Democrats need a net gain of three House seats and four Senate seats to take control, in a campaign set to break the record for ad spending.
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All 435 House seats and 35 Senate seats are up for election on November 3, along with 36 governorships.
Democrats need a net gain of three seats to win the House and four to win the Senate.
Advertising spending for the cycle is forecast at about $12 billion, a record for a midterm.