  We consider the observational constraints on the running-mass inflationary
model, and in particular on the scale-dependence of the spectral index, from
the new Cosmic Microwave Background (CMB) anisotropy measurements performed by
WMAP and from new clustering data from the SLOAN survey. We find that the data
strongly constraints a significant positive scale-dependence of $n$, and we
translate the analysis into bounds on the physical parameters of the inflaton
potential. Looking deeper into specific types of interaction (gauge and Yukawa)
we find that the parameter space is significantly constrained by the new data,
but that the running mass model remains viable.
