  We discuss the angular clustering of galaxy clusters at z > 1 selected within
50 sq. deg from the Spitzer Wide-Infrared Extragalactic survey. We employ a
simple color selection to identify high redshift galaxies with no dependence on
galaxy rest-frame optical color using Spitzer IRAC 3.6 and 4.5 micron
photometry. The majority (>90%) of galaxies with z > 1.3 are identified with
[3.6] - [4.5] > -0.1 AB mag. We identify candidate galaxy clusters at z > 1 by
selecting overdensities of >26-28 objects with [3.6] - [4.5] > -0.1 mag within
radii of 1.4 arcminutes, which corresponds to r < 0.5 Mpc/h at z=1.5. These
candidate galaxy clusters show strong angular clustering, with an angular
correlation function represented by w(theta) = (3.1 +/- 0.5) theta^(-1.1 +/-
0.1) with theta in units of arcminutes over scales of 2-100 arcminutes.
Assuming the redshift distribution of these galaxy clusters follows a fiducial
model, these galaxy clusters have a spatial-clustering scale length r_0 = 22.4
+/- 3.6 Mpc/h, and a comoving number density n = 1.2 +/- 0.1 x 10^-6
(Mpc/h)^-3. The correlation scale length and number density of these objects
are comparable to those of rich galaxy clusters at low redshift. The number
density of these high-redshift clusters correspond to dark-matter halos larger
than 3-5 x 10^13 h^-1 solar masses at z=1.5. Assuming the dark halos hosting
these high-redshift clusters grow following Lambda-CDM models, these clusters
will reside in halos larger than 1-2 x 10^14 h^-1 solar masses at z=0.2,
comparable to rich galaxy clusters.
