The money behind US midterm races

The amount of money spent on advertising for the US midterm races has surpassed $11.6bn. That’s even more than the last presidential election. The sheer volume of cash makes these midterms the most expensive political race in US history. Al Jazeera’s Heidi Zhou-Castro went to a racetrack in Lexington, Kentucky, to break it all down. #USMidterms #USPolitics #USElections #CampaignFinance #PoliticalAds #Democrats #Republicans #BreedersCup #AlJazeeraEnglish