  Various inflationary scenarios can often be distinguished from one another by
looking at the squeezed limit behavior of correlation functions. Therefore, it
is useful to have a framework designed to study this limit in a more systematic
and efficient way. We propose using an expansion in terms of weakly coupled
super-horizon degrees of freedom, which is argued to generically exist in a
near de Sitter space-time. The modes have a simple factorized form which leads
to factorization of the squeezed-limit correlation functions with power-law
behavior in $k_{\rm long}/k_{\rm short}$. This approach reproduces the known
results in single-, quasi-single-, and multi-field inflationary models.
However, it is applicable even if, unlike the above examples, the additional
degrees of freedom are not weakly coupled at sub-horizon scales. Stronger
results are derived in two-field (or sufficiently symmetric multi-field)
inflationary models. We discuss the observability of the non-Gaussian 3-point
function in the large-scale structure surveys, and argue that the squeezed
limit behavior has a higher detectability chance than equilateral behavior when
it scales as $(k_{\rm long}/k_{\rm short})^\Delta$ with $\Delta<1$ -- where
local non-Gaussianity corresponds to $\Delta=0$.
