Togetherism for Survival
Togetherism, as an abstraction of Communism and Democracy
Two of the most prominent surviving political ideologies arguably are democracy and communism. However, when you look deeper, democracy is about deciding and thinking together, and communism is about doing and having together.
So, both ideologies talk about togetherness in one aspect or another. Unity as such, has been a defining theme of nations and organizations across centuries. Many even today have retained the theme in the national mottos.
The idea of the concept of "Together_ism_" as such might work as a part of a political campaign or ideology, that promotes cooperation rather than conflict.