The Federal Election Commission has finally come up with a handy, searchable database of independent spending in House and Senate races across the country, so we can all find out what's being spent, where it's being spent, and what it's being spent on.
Independent expenditures are disclosed more frequently than candidate spending this close to Election Day. Once an entity has spent over $10,000 on a race, it has 48 hours to disclose its additional spending; within 20 days of an election, entities that have spent more than $1,000 on an race have 24 hours to disclose new spending.
Check out the new, searchable database here. Click "Customize Data" to search for an individual spender or race.
Another resource: the independent-expenditure database maintained by the Sunlight Foundation.