Is Johnson & Johnson an Underdog in the Coronavirus Vaccine Race?

Johnson & Johnson's candidate is called Ad26.COV2.S, and it's an adenoviral vector vaccine. It works by introducing a gene from the SARS-CoV-2 virus, which causes COVID-19, into the recipient's cells using another virus (an adenovirus), thereby instructing those cells to make the SARS-CoV-2 virus protein.