  We study the Baldwin Effect (BE) in 96 core-jet blazars with optical and
ultraviolet spectroscopic data from a radio-loud AGN sample obtained from the
MOJAVE 2 cm survey. A statistical analysis is presented of the equivalent
widths ($W_{\lambda}$) of emission lines H$\beta\,\lambda$4861, Mg
II\,$\lambda$2798, C IV\,$\lambda$1549, and continuum luminosities at
5100\,\AA, 3000\,\AA, and 1350\,\AA. The BE is found statistically significant
(with confidence level \textit{c.l.} $\geq\,$ 95\%) in H$\beta$ and C IV
emission lines, while for Mg II the trend is slightly less significant
(\textit{c.l.} = 94.5\%). The slopes of the BE in the studied samples for
H$\beta$ and Mg II are found steeper and with statistically significant
difference than those of a comparison radio-quiet sample. We present
simulations of the expected BE slopes produced by the contribution to the total
continuum of the non-thermal boosted emission from the relativistic jet, and by
variability of the continuum components. We find that the slopes of the BE
between radio-quiet and radio-loud AGN should not be different, under the
assumption that the broad line is only being emitted by the canonical broad
line region around the black hole. We discuss that the BE slope steepening in
radio AGN is due to a jet associated broad-line region.
