I'm a researcher at the Online Political Transparency Project at NYU. As part of our work, we extract all political ads from Facebook's Ad Library API and run them through an analysis pipeline every day as part of our work screening ads for misinformation or scams. As a result, we were also sitting on lots of information about regular (non-deceitful) political advertisers and races. We thought it would be a shame to leave all that data that is probably really interesting to the general public locked up on our servers, so we also built this site for looking at overviews of political ad spending on Facebook. You can look at spend by senate, house, or gubenatorial race. You can look up specific ad sponsor and see an overview of their political ad spend. Also, you can see overviews of spending in particular states, including top spenders in that state and spend by ad topic and ad purpose.