Well in 1/3 of US provisional elections in the 21st century, the candidate with the most votes has lost the election thanks to the electoral college. So even if they did go vote, there is a 1 in 3 chance that the candidate with the most votes loses the election.

Which is really weird because the US brands itself as the bastion of freedom and democracy internationally, yet they do not follow two of the most important principles of democracy itself. Those being one man equals one vote, and the candidate with the most votes wins. Lots of people in the USA effectively do not have a vote for president with how the electoral college is structured.