A gentle reminder when talking about about the presumptive Democratic nominee for President, from someone who doesn't talk politics here:

Referring to someone by their last name is generally a sign of respect. Referring to someone by their first name is generally a sign of intimacy. Consider how people have referred, in short form, to other nominees and Presidents:

Bush, Clinton, Gore, Bush, Kerry, Obama, Romney, McCain, Biden, Trump

And then

Hillary and Kamala

See a pattern?