  Coarsening and persistence of Ising spins on a ladder is examined under voter
dynamics. The density of domain walls decreases algebraically with time as
$t^-{1/2}$ for sequential as well as parallel dynamics. The persistence
probability decreases as $t^{-\theta_{s}}$ under sequential dynamics, and as
$t^{-\theta_{p}}$ under parallel dynamics where $\theta_{p} = 2 \theta_{s}
\approx .88$. Numerical values of the exponents are explained. The results are
compared with the voter model on one and two dimensional lattices, as well as
Ising model on a ladder under zero-temperature Glauber dynamics.
