I would have been stunned. Did Hillary choose not to run for some reason? Was it a divorce with Bill? Biden must have very narrowly lost 2016 to someone like Jeb Bush. Bush v. Biden turns out to be even more controversial than Bush v. Gore and Biden won the popular vote by 2M votes yet lost the deciding state let's say, VA by 115 votes?
Liberals finally get their revenge for 2000 (and 2016) and deliver Biden the win in 2020 with a fairly comfortable victory after Jeb Bush has an unpopular term in office.
It's really interesting that anyone assumed HRC to run (and eventually win) the 2016 election, although she always declined an intention to run throughout 2013 and 2014. At some point I thought she may actually not run.
Those were fake
For some reason, it was customary for politicians to pretend they weren't running up until they announced despite how obvious it is.
Hillary and Jeb Bush swore they weren't running for president while fundraising millions. So did Rubio. There is a TIME magazine article from 2006 interviewing Obama, where he swears he isn't running in 2008. If you read his new book "The Promise Land" his team was preparing for a run since Kerry lost in 2004.
I appreciated how both Biden and Sanders were honest about running as soon as 2017.