https://www.nationalreview.com/2020/03/joe-biden-campaign-known-quantity-compared-other-democrats/
As others sank in the polls, Biden seemed a known quantity in comparison.
For most of early 2019, Democratic presidential candidate Joe Biden — the declared custodian of liberalism who would continue the Obama glory years — seemed unstoppable.
He led all other rivals for months. Biden seemed above the fray. Many Democrats saw the pre-debate and pre-election race for the nomination as more of a Biden coronation than a contest.
In the summer and fall debates of 2019, Biden was occasionally confused about dates, places, names, and facts. In public appearances, he often seemed grouchy or dazed.
Biden was once faulted for being too handsy in his interactions with women; now he was being criticized for losing his temper and insulting people during campaign stops.
Democratic candidates such as Cory Booker, Pete Buttigieg, Julian Castro, Kirsten Gillibrand, Kamala Harris, Amy Klobuchar, and Elizabeth Warren had all wounded the septuagenarian Biden, portraying him as too moderate and out of touch with contemporary green and diversity issues.