The proverbial "sh*t is hitting the fan" now in the Democratic presidential primary.

I haven't seen the full rally, but Bernie Sanders was speaking to a crowd in Philadelphia tonight, when he launched into his most heated attack against Hillary Clinton so far.

Rachel Maddow played the clip and expressed surprise also as she said, "going after his Democratic opponent in a way that we have not heard before in this Democratic fight."

Sanders...she has been saying lately that she thinks that I am 'not qualified' to be president.

Well, let me, let me just say in response to Secretary Clinton: I don't believe that she is qualified, if she is, through her SUPER PAC, taking tens of millions of dollars in special interest funds. I don't think that you are qualified if you get $15 million from Wall Street through your super PAC."

I don't think you are qualified if you have voted for the disastrous war in Iraq. I don't think you are qualified if you have supported virtually every disastrous trade agreement which has cost us millions of decent paying jobs. I don't think you are qualified if you've supported the Panama free trade agreement, something I very strongly opposed and, which as all of you know, has allowed corporations and wealthy all over the world people to avoid paying their taxes to their countries.

Rachel Maddow came back and tried to figure out why Bernie said what he did.

"What we think this is about is, what we think he's referencing there, Secretary Clinton saying today in an interview that Bernie Sanders has not done his homework on some issues that have come up in the campaign, in a sort of rough interview that he had with the editorial board of the NY Daily News in the last few days. Sanders is responding to that characterization tonight by saying, 'Hillary Clinton is not qualified to serve as president of the United States."

I agree with Rachel Maddow. Clinton was on Morning Joe earlier today, and he kept pressuring her to say that Bernie wasn't qualified to be president, which she didn't.

Here's the video:

Scarborough: We've been talking about Bernie Sanders' New York Daily News interview. And I want to start with that. And ask you in light of the interview, in light of the questions he had problems with, do you believe this morning that Bernie Sanders is qualified and ready to be President of the United States?

CLINTON: Well, I think the interview raised a lot of really serious questions and I look at it this way. The core of his campaign has been ‘break up the banks,’ and it didn’t seem in reading his answers that he understood exactly how that would work under Dodd-Frank, exactly who would be responsible, what the criteria were, and you know, that means you can’t really help people if you don’t know how to do what you are campaigning on saying you want to do.”

Scarborough: So is he, is he qualified? ...I know there are a lot of examples where he came up short and the interviewers were having to repeat questions and so the question, and I’m serious, if you weren’t running today and you looked at Bernie Sanders, would you say, ‘This guy is ready to be president of the United States’?”

Clinton: Well, I think he hadn’t done his homework, and he’d been talking for more than a year about doing things that he obviously hadn’t really studied or understood, and that does raise a lot of questions. And really what that goes to is for voters to ask themselves, Can he deliver what he is talking about, can he really help people, can he help our economy, can he keep our country strong?

She never said Bernie wasn't qualified to be president even though Scarborough was begging for it. Did she play rough? Absolutely.

The Washington Post ran a story with a headline like this: Clinton questions whether Sanders is qualified to be president, which is a recap of the MSNBC interview.

The two candidates have been trading barbs, which is expected, but it's been pretty civil compared to the Republicans.

I wonder who gave Bernie this information?

Both candidates are qualified for the job and you can't say the same for the Republicans.

I do know that the next few weeks are going to be really brutal for everybody.