In the blogosphere, where partisan passion lives, divisions extend to reading and broadcast material, too.

NationalJournal.com's panel of top political bloggers was asked to join in the survey of National Journal and The Atlantic Wire about which columnists, bloggers and television or radio commentators most helped to shape their opinion or worldview. No one received votes from both the left and right; of the 63 people named in total, only 23 appeared on more than one of the 22 combined ballots.

Related coverage: See how National Journal's panel of 375 Political and Congressional Insiders responded.