What is the phenomenon that occurs whne a boting group grows larger enough to change the ptl?

Tipping

Explanation:

Tipping is a term used in the political landscape to describe a situation or occurrence in which a group of eligible voting individuals with a relatively huge number of members decided enough to shift the political balance in the district, state, or country.

Hence, the phenomenon that occurs when the voting group grows larger enough to change the political balance is known as TIPPING.