  Small Drude weight $D$ together with small specific heat coefficient $\gamma$
observed in the ferromagnetic phase of R$_{1-x}$A$_x$MnO$_3$ (R=La, Pr, Nd, Sm;
A=Ca, Sr, Ba) are analyzed in terms of a proximity effect of the Mott
insulator. The scaling theory for the metal-insulator transition with the
critical enhancement of orbital correlations toward the staggered ordering of
two $e_g$ orbitals such as $3x^2-r^2$ and $3y^2-r^2$ symmetries may lead to the
critical exponents of $D \propto \delta^{u}$ and $\gamma \propto \delta^v$ with
$u=3/2$ and $v=0$. The result agrees with the experimental indications.
