I've always thought rating a race as a tossup without any sort of actual prediction to be cowardly. It basically means you've given up on predicting the race. I prefer calling something Tilt D or Tilt R rather than a tossup. Do you agree?
If one uses “tossup” as a shield … yes.
People who follow electoral politics, and that includes people who post on this site, should be able to tell which of the two major U.S. political parties will win an upcoming U.S. presidential election cycle. This is especially the case in which there will be a White House party switch.
If one uses “tossup” for purpose of caution … it is OK if there is a long period between that time and the scheduled date of an upcoming U.S. presidential election.