There is nothing to "believe", this is factual. It is proven by their data. The amount of reaching liberal-era does to justify MSNBC's behavior is insane. Pure, utter insanity.
This is not data:
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Selectively giving the numbers within the text of the article is not data. It is, at best, cherry picking.
I don't disagree with the premise that Sanders gets less coverage relative to other competitive candidates. The notion that its an intentional bias is the Sanders campaign trying to paint an "us vs. the world" victim narrative though, which itself is disingenuous.
A core concept needed to understand how most people act is this: Never assume deviousness when stupidity/laziness is an equally valid reason.
Brian Williams and Chris Matthews, the two oldest, longest tenured hosts, give Sanders the last coverage. How is that surprising? They're both long time neolibs. Matthews still gushes over 3rd way dems when he has them on his show. Their target audiences are those same neolib/third way dems. Don't go to a burger shack expecting steak.
Hayes, Melber, and O'Donnell, by the unscientific graph above even, give Sanders more generally positive coverage than Biden by some abstract amount. So by the time you get to where younger liberals are tuning in Sanders is the second favored candidate.
Then Maddow, their headliner, is generally universally positive about both Warren and Sanders and comparatively one of the least friendly towards Biden.
The Sanders campaign actively attacks neolib/centrist dems and their ideology, then wonders why centrist/neo lib focused media like Matthews and Williams doesn't respond kindly. Most people generally don't say kind things to those talking shit about them.
This is made worse by the simple fact that the Sanders campaign isn't looking to work with the mainstream media covering them but instead to use them as red meat for their base. They keep biting the hand that they claim should be feeding them.
Sanders has a generally good message but he's got some real issues with how his campaign has been staffed.
Weaver is out, which should be a net positive (in my opinion at least), but his replacement, Faiz Shakir, has zero experience as a campaign manager, let alone as the campaign manager for a POTUS run. He has a strong resume in politics but also very little experience even being a senior level staffer in a political campaign.
Meanwhile Warren's campaign manager, Roger Lau, is about the same age as Shakir but has ran successful senate and congressional runs for Warren, Kerry, Richard Neal and Niki Tsongas as well as being a staffer for Kerry's POTUS run.
Biden meanwhile has Greg Schultz, who was a director for Clinton in the 2008 primary, an Obama state director in the general, and then served as an advisor to Biden during his time as VP.
Of the three Warren is clearly the one best managing her media coverage. She also happens to have the most experienced campaign manager by a country mile. These things aren't coincidences. The media isn't an ally to any politician, it needs to be managed, hence why media managers and campaign managers are a core part of any campaign.