Note: I struck out a disingenuous statement in your post. if you want to discuss that bit of fakery, I'll be glad to do so. I have read the transcript you included links to and your post misquotes Biden in the section that was struck.
Maybe you should have been listening to the debate instead of channeling what some thought guide tells you happened. So, here is the exact record of that conversation. You tell me where Joe lies:
Watch Part 3 of the CNN-Univision Democratic debate between former Vice President Joe Biden and Sen. Bernie Sanders (I-VT) from Washington.
www.cnn.com
CNN video replay of the debate, Part 3, beginning at 6:45
The exact words of and the context of the question Sanders asked:
Sanders: "Let me ask you a question, Joe, you're right here with me. Have you been on the floor of the Senate, you were in the Senate"
Joe interjects: "Yeah".
Sanders: "Time and time talking about the necessity, with pride, about cutting Medicare, cutting Social Security, cutting veterans programs",
Joe interjects, "no"
Sanders: "You never said that"
Joe: "no"
Sanders: "Alright, America, go to the website right now. Go to the youtube right now. Time after time -- you were not a fan of Bowe Simpson?"
Joe: "I was not a fan of Bowle-Simpson"
Sanders: "You were not a fan of the balanced budget amendment which calls for cuts in Social Security? Come on Joe, you were."
Joe: "look, here's the deal"
Sanders: "Why don't you just tell the truth here, we all make mistakes"
Joe: "I am telling the truth. You said that I in fact... why am I rated at 96% by the Social Security organizations? Why am I viewed as a strong supporter? I have have laid out how I will increase Social Security benefits. I have laid out how it is in fact going to be paid for. Go to Joe Biden.com, look at my exchanges with Paul Ryan and his desire to privatize and or cut Social Security and understand how he (points at Sanders) manipulated an ad."
Sanders: "Joe let me repeat it again, I want you to be straight with the American People. I'm saying that you have been on the floor of the Senate time and time again talking about the need to cut social security, medicare and veterans programs. Is that true or is that not true?"
Joe: "No that is not true"
Sanders "THAT IS NOT TRUE?"
Joe: "
That is not true. What is true is, in discussions on how to deal with the deficit, everything was on the table. I did not support any of those cuts. In Social Security, in Veteran's benefits,
Sanders "Whoa, whoa, whoa! Everything was on the table, including, in your judgement, cuts to social security."
Joe: In order to get the kinds of changes we need on other things related"
Sanders: "So"
Joe: "But we did not cut it, I did not go for it"
Sanders: "Because people like me stopped it"
Joe: "laughs"
Sanders: "Joe, you just contradicted yourself"
So, that's the whole discussion. At no point does Joe lie there. He did not support or vote for cuts in Social Security. Is the very act of allowing the discussion of cuts to those programs somehow an act of guilt? Is that what you are saying?
Regarding the claim about his statements, you said: "Meanwhile during the debate last night he denied ever doing so."
If you say he lies, you have to do more than just say he did. Joe Biden in fact did not support a cut of Social Security in a speech on the Senate floor in 1984.
In addition, I've transcribed the debate conversation accurately and nowhere in there does he deny supporting making a one year freeze in Medicare. He denies the accusation that Bernie made, that Biden talked about the "need to cut Social Security". If the section you copied from the Congressional Record is intended to prove that, it fails.
I'm not going to try to prove a negative. I refer to the
Politifacts piece. They found Bernie's ad "mostly false". Bernie claims Politifacts and Washington Post are false. That's the part where I stopped listening. My ability to suspend disbelief in what Sanders is saying ended there.