According to OpenSecrets.org, it is well out of the norm for him to raise that much money. The democrats brought in a lot of out of state money to win the seat:
You could click on the link and read the content there, which includes that very information. For more detailed breakdowns, FEC.gov lets you do exhaustive filtering and has excellent export options.
https://www.opensecrets.org/races/geography?cycle=2020&id=SC...