The National Constitution Center was established by Congress to "disseminate information about the United States Constitution on a non-partisan basis in order to increase the awareness and understanding of the Constitution among the American people."
The Constitution and the Administrative State (Jan. 10, 2017) ("federal judges and scholars explore important historical and constitutional issues related to the administrative state"; cosponsored by the Federal Judicial Center).
Populism, Demagogues, and Constitutional Democracy (Dec. 8, 2016) ("discussion about the rising tide of populism and constitutional values, featuring Robert Kagan, Michael Kazin, Nancy Rosenblum, and John Yoo")
American Society of International Law, International Law and the Trump Administration: An Online Series.
What Is Administrative Law? Short video from UW Tech Policy Lab.
Belinda Stutzman, How is power divided in the United States government?, Ted-Ed
Christina Greer, Does your vote count? The Electoral College explained, Ted-Ed
Christina Greer, How do executive orders work?, Ted-Ed [2017]
Alex Gendler, How Does Impeachment Work?, Ted-Ed
PBS has produced (2015-16) a series of 48 short videos giving a Crash Course in Government and Politics. You can view them on the PBS site or on YouTube. (The YouTube videos seem to load faster.)
Of particular interest: