  We present the results of a Spitzer search for obscured AGN in the Chandra
Deep Field-North, using both radio-excess and mid-infrared power-law selection.
AGN selected via the former technique tend to lie at z ~ 1, have SEDs dominated
by the 1.6 micron stellar bump, and have Seyfert-like X-ray luminosities (when
detected in the X-ray). In contrast, the IRAC (3.6-8.0 micron) power-law
selected AGN lie at higher redshifts of z ~ 2, and comprise a significant
fraction of the most X-ray luminous AGN in the CDF-N. While there is almost no
overlap in the AGN samples selected via these two methods, their X-ray
detection fractions are very similar. Only 40% and 55% of the radio-excess and
power-law samples are detected in the 2 Ms X-ray catalog, respectively. The
majority of the AGN selected via both methods are consistent with being
obscured (N_H > 10^(22) cm^-2), but not Compton-thick (N_H > 10^(24) cm^-2),
although Compton-thick candidates exist in both samples. We place an upper
limit of <82% (or < 4:1) on the obscured fraction of the power-law sample,
consistent with predictions from the cosmic X-ray background. The sources
selected via the power-law criteria comprise a subset of AGN selected via other
IRAC color-color cuts. While smaller in number than the color-selected samples
in the deep fields, the power-law sample suffers from less contamination by
star-forming galaxies.
