I know that a lot of folks don't like Mark Halperin because he's the typical Morning Joe/Villager/Beltway-elite poobah that sets and drives media narratives and becomes arbiter of what is and isn't going to be the dominant themes of a campaign.
Like it or not, that's exactly he matters. It'd be great if we lived in a media world where Mark Halperin (and Mike Allen, and David Gregory, and... well, pick 'em) didn't exist and have the power that he does.
We don't live in that world. So follow me over the fold.