(colloquial) on the popular or apparently winning side, as in an
election. The expression comes from the
fact that, in the mid-nineteenth century, it was customary in the United
States, especially in the southern
states, for a
band to
play on a
wagon through the streets to advertise a forthcoming
meeting, political or otherwise. At
election time local leaders would show their support of a candidate by climbing on the
wagon and
riding with the
band.