"Of course XYZ political party is going to sweep the polls in the coming elections. Everybody is saying so." Which informal fallacy is committed in the above statement?

The claim rests only on the fact that everybody is saying so, an appeal to majority.

Popularity of a belief is offered as the sole ground for its truth.

How many people assert something has no bearing on whether it is the case.

The election outcome is a matter of fact, not of numbers who predict it.

Substituting common opinion for evidence is argumentum ad populum in its bandwagon form.

Wide agreement is treated, wrongly, as if it were proof.