Nancy Pelosi is praised for presiding over the Donald Trump impeachment process successfully, and is hailed as one of the most powerful House speakers of all time. Joy Reid and her panel discuss why House Speaker Nancy Pelosi ‘Won the Year’ in 2019 politics. Plus: Reps. Ayanna Pressley, Alexandria Ocasio-Cortez, Ilhan Omar, and Rashida Tlaib are praised for their innovative legislation introduced in 2019 by political expert, Tiffany Cross of The Beat DC. And: Trump’s impeachment trial in the Senate must have witnesses to offer fresh testimony constitutional expert Laurence Tribe tells Joy Reid. Tribe adds that hearing from witnesses such as Mick Mulvaney and more will, ‘dot the i’s and cross the t’s and resolve any remaining ambiguity.’ Next: Trump’s impeachment vs. Bill Clinton’s impeachment offer ‘no comparison’ when weighing the surrounding circumstances according to former Sen. Barbara Boxer, who also tells Joy Reid, ‘I have stopped trying to predict what this [president] will do.’ All this and more in this Sunday, year-ending edition of AM JOY on MSNBC.