  We present proper motions obtained from a dual frequency, six-epoch, VLBA
polarization experiment monitoring a sample of 12 blazars. The observations
were made at 15 GHz and 22 GHz at bi-monthly intervals over 1996. Ten of the
eleven sources for which proper motion could be reliably determined are
superluminal. Only J2005+77 has no superluminal components. Three sources
(OJ287, J1224+21, and J1512-09) show motion faster than 10h^{-1}c, requiring
$\gamma_{pattern}$ of at least 10h^{-1}c (H_0 = 100h km/s/Mpc). We compare our
results to those in the literature and find motions outside the previously
observed range for four sources. While some jet components exhibit significant
non-radial motion, most motion is radial. In at least two sources there are
components moving radially at significantly different structural position
angles. In five of six sources (3C120, J1224+21, 3C273, 3C279, J1512-09, and
J1927+73) that have multiple components with measurable proper motion, the
innermost component is significantly slower than the others, suggesting that
acceleration occurs in the jet. In the motions of individual components we
observe at least one decelerating motion and two ``bending'' accelerations
which tend to align their motions with larger scale structure. We also discuss
in detail our procedures for obtaining robust kinematical results from
multi-frequency VLBI data spanning several epochs.
