So according to Lichtman, the President could be caught on video sexually molesting children then murdering them, but if seven of the criteria listed in his model were true, the President would be re-elected. Seems to me his model may not be sufficient to cover all the possibilities.
According to Gödel's incompleteness theorems, no model is ever sufficient to cover all the possibilities.
https://en.wikipedia.org/wiki/G%C3%B6del%27s_incompleteness_theorems