  A dual Banach algebra is a Banach algebra which is a dual space, with the
multiplication being separately weak$^*$-continuous. We show that given a
unital dual Banach algebra $\mc A$, we can find a reflexive Banach space $E$,
and an isometric, weak$^*$-weak$^*$-continuous homomorphism $\pi:\mc A\to\mc
B(E)$ such that $\pi(\mc A)$ equals its own bicommutant.
