After an uproarious attack on the U.S. Capitol last week, Vice President Mike Pence split from his commander-in-chief and quickly condemned the mob-like behavior from pro-Trump supporters—leadership that was tested as President Donald Trump initially hesitated to act. Pence has exercised “unflinching loyalty” towards Trump up until this point, as the president blasted Pence’s constitutional duty in certifying the electoral college results. Trump and his close allies attempted to push his political partner to reject the vote based on baseless claims of voter fraud, but Pence firmly denied the request and proceeded with his authority over the Senate—a job that...