Open Secrets is your guide to the Money in U.S Elections. Here you can find out how much financial backing the different candidates have in the race to get elected.
You’ll be able to see which companies, industries, and lobbying groups have donated to which candidates, and how much. The site also explains “dark money” which is spending meant to influence political outcomes where the source of the money is not disclosed.
The site also lets you explore donations to presidential and congressional races and even check out the personal finances of candidates. There’s a lot of data to go through, but they do manage to break it down fairly simply. Check it out and let me know what you think.