PACs have raised more than $790 million for the upcoming midterm election. And though there are 35 Senate seats up for re-election, the bulk of spending is being deployed in just 10 races.

PACs have raised more than $790 million for the upcoming midterm election. And though there are 35 Senate seats up for re-election, the bulk of spending is being deployed in just 10 races. https://t.co/UMxPGATg5j pic.twitter.com/qRtqaHR2xP

— CNBC (@CNBC) October 4, 2018