We can assume that $w=0$ (replace $p$ by $q=p-w$). Then $p=c\prod (z-a_j)$ with $|a_j|\ge 1$. Since $$ \frac{p'}{p} =\sum_{j=1}^n \frac{1}{z-a_j} , $$ we want to show that $$ 1 - \frac{1-e^{i\psi}}{n} \sum_{j=1}^n \frac{z}{z-a_j} $$ does not take the value $0$ on $|z|<1$, or, equivalently, the equation $$ \frac{1}{1-e^{i\psi}} = \frac{1}{n} \sum_{j=1}^n \frac{1}{1-a_j/z} \quad\quad\quad (1) $$ can not be solved with a $|z|<1$.
The map $z\mapsto 1/z$ maps the circle of radius $1$ with center $z_0=1$ to the vertical line $L$ given by $\textrm{Re}\, z=1/2$. Now $1-e^{i\psi}$ is on this circle while the $1-a_j/z$ are outside (recall that $|a_j|\ge 1$, $|z|<1$). Thus what we are trying to do in (1) is to satisfy $$ u = \frac{1}{n} \sum_{j=1}^n v_j $$ with $u$ on $L$ and all $v_j$'s on one side of $L$. Clearly this is impossible.