It's debate day, a chance for the 2020 hopefuls to distinguish themselves. Democrats agree on the topic that looms largest - the impeachment inquiry - but questions remain. Will Hunter Biden's dealings in Ukraine hurt his father? Will any of Biden's rivals raise ethics concerns? How will the inquiry play among moderates? CNN political director David Chalian is joined by CNN political correspondent Abby Phillip and CNN political commentator Maria Cardona to talk through the latest impeachment inquiry implications.