  We show that bars in galaxy models having halos of moderate density and a
variety of velocity distributions all experience a strong drag from dynamical
friction unless the halo has large angular momentum in the same sense as the
disk. The frictional drag decreases the bar pattern speed, driving the
corotation point out to distances well in excess of those estimated in barred
galaxies. The halo angular momentum required to avoid strong braking is
unrealistically large, even when rotation is confined to the inner halo only.
We conclude, therefore, that bars are able to maintain their observed high
pattern speeds only if the halo has a central density low enough for the disk
to provide most of the central attraction in the inner galaxy. We present
evidence that this conclusion holds for all bright galaxies.
