  We present a theory of superconducting pairing originating from soft critical
fluctuations near isospin-polarized states in rhombohedral trilayer graphene.
Using a symmetry-based approach, we determine possible isospin order types and
derive the effective electron-electron interactions mediated by isospin
fluctuations. Superconductitivty arising due to these interactions has symmetry
and order parameter structure that depend in a unique way on the "mother"
isospin order. This model naturally leads to a superconducting phase adjacent
to isospin-ordering phase transition, which mimics the behavior observed in
experiment. The symmetry of the paired state predicted for the isospin order
type inferred in experiments matches the observations. These findings support a
scenario of superconductivity originating from electron-electron interactions.
