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We present a Stokes I, Q and U survey at 189 MHz with the Murchison WidefieldArray 32-element prototype covering 2400 square degrees. The survey has a 15.6arcmin angular resolution and achieves a noise level of 15 mJy/beam. Wedemonstrate a novel interferometric data analysis that involves calibration ofdrift scan data, integration through the co-addition of warped snapshot imagesand deconvolution of the point spread function through forward modeling. Wepresent a point source catalogue down to a flux limit of 4 Jy. We detectpolarization from only one of the sources, PMN J0351-2744, at a level of 1.8\pm 0.4%, whereas the remaining sources have a polarization fraction below 2%.Compared to a reported average value of 7% at 1.4 GHz, the polarizationfraction of compact sources significantly decreases at low frequencies. We finda wealth of diffuse polarized emission across a large area of the survey with amaximum peak of ~13 K, primarily with positive rotation measure values smallerthan +10 rad/m^2. The small values observed indicate that the emission islikely to have a local origin (closer than a few hundred parsecs). There is alarge sky area at 2^h30^m where the diffuse polarized emission rms is fainterthan 1 K. Within this area of low Galactic polarization we characterize theforeground properties in a cold sky patch at $(\alpha,\delta) =(4^h,-27^\circ.6)$ in terms of three dimensional power spectra

A 189 MHz, 2400 square degree polarization survey with the Murchison Widefield Array 32-element prototype