Question

Is there a source in the Torah for following the majority? (Aside from the exposition of the verse “incline after the many,” which ironically seems to say precisely that one may not follow the many just because they are the many if their ruling is bad.)
At first glance, it seems that the Sages adopted the idea that one should follow the majority either on the basis of reasoning or from the prevailing practice among the sages of the time (democracy, etc.), and only afterward looked for a source for it in the Torah and inserted it there as well. But I don’t know all the sources well enough to say that with certainty.
Does that sound reasonable or correct to the Rabbi? (It doesn’t seem especially more problematic than other Torah-level laws that are derived from reasoning.)