New campaign finance data shows House and Senate candidates are on pace to spend a record $2 billion by next Tuesday’s midterm election. A new report from the Public Campaign Action Fund estimates House candidates could end up spending $1.5 billion — with most of the money being spent on the ninety races seen as still in play. Senate candidates are on pace to spend $550 million. In addition, outside groups are expected to end up spending over $400 million, much of it raised from secret donors.