NYT First Draft:

New fund-raising tallies filed by two leading “super PACs” show just how dependent each party’s Senate candidates have become not just on rich donors, but on an incredibly small number of incredibly rich donors.

Take the Senate Majority PAC, the Democratic group founded by former aides of the Senate majority leader, Harry Reid. The PAC has led all outside groupson behalf of Senate Democrats in their battle to hold on to the Senate.

Through the end of September, the group had raised about $47 million. About half of it, $23.1 million, came from just 16 people or corporate entities they control. About $11 million came from labor unions, whose contributions are drawn from members’ dues and contributions.