This is interesting. The Daily Kos looked at where their stories originated (both primary and secondary sources), and found that newspapers were the
main most common source. Not very surprising given the type of blog The Daily Kos is, but still.
Newspapers: 102 primary, 21 secondary
Blogs: 83 primary, 19 secondary
Advocacy organizations: 77 primary, 9 secondary
Television network: 69 primary, 14 secondary
Online news organizations: 54 primary, 5 secondary
Magazines and journals: 36 primary
Political trade press: 28 primary
Research/polling: 20 primary
Wikipedia: 21 primary, 8 secondary
Educational (.edu): 15 primary
Government: 14 primary, 5 secondary
Campaigns: 13 primary
Books: 6 primary
AP and other Wire: 5 secondary
Radio: 4 primary
Read the full thing, with something of an analysis, and take to heart if you will.
Author: Thord Daniel Hedengren
Thord Daniel Hedengren is a designer, writer, and blogger, and also the former editor of The Blog Herald. He used to be a hotshot in the gaming industry in Sweden, but sold everything and went International. Most recently he wrote a book called Smashing WordPress: Beyond the Blog, and does loads of kickass design.