The world's most expensive election

https://www.bbc.com/news/av/election-us-2 [login to see] 6
The 2020 US election campaigns smashed all records - with presidential and congressional candidates spending a total of almost $14bn - more than double the price tag for 2016.

This year the campaigns had to contend with the coronavirus pandemic, but what explains the huge increase?

BBC Reality Check breaks down some of the spending and who paid for it.