The ornamental design for a portable, modular voting booth, as shown and described.
FIG. 1 is a front-left perspective view of a portable, modular voting booth according to our new design.
FIG. 2 is a right side view of the portable, modular voting booth as in FIG. 1. The left side view of the portable, modular voting booth is a mirror image of FIG. 2.
FIG. 3 is a top view of the portable, modular voting booth as in FIGS. 1-2.
FIG. 4 is a bottom view of the portable, modular voting booth as in FIGS. 1-3.
FIG. 5 is a front view of the portable, modular voting booth as in FIGS. 1-4; and,
FIG. 6 is a back view of the portable, modular voting booth as in FIGS. 1-5.
The broken lines shown in the drawings are for illustrative purposes only and form no part of the claimed design.