Can't muster the interest to watch. I may comment on some of the specific proposals.
70,000 new Math and Science teachers.
Great idea as a concept. We sure could use them but market incentives for high level math and hard science skills trend heavily against this ever coming to pass. Engineering careers and computer fields absorb most of our native math talent. This isn't the same thing as Clinton's 100,000 cops - the human resource here is not as fungible , hence the shortage. We can't even import enough immigrants with math degrees to fill our research programs in private industry and at universities, much less the k-12 public schools.
Why teach fresh out of college for $ 22 -29k when someone with a math degree can go to work in the computer industry for twice that and make a salary in four or five years with a Bachelor's degree what they couldn't make after 30 years in the public schools with a Ph.D ? I'm not certain how we can have brilliant math and science teachers who are also strangely unaware of basic economics.