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We present the latest catalog of more than 1200 spectroscopically-selectedclose binary systems observed with the Sloan Digital Sky Survey through DataRelease Five. We use the catalog to search for magnetic white dwarfs incataclysmic variable progenitor systems. Given that approximately 25% ofcataclysmic variables contain a magnetic white dwarf, and that our large sampleof close binary systems should contain many progenitors of cataclysmicvariables, it is quite surprising that we find only two potential magneticwhite dwarfs in this sample. The candidate magnetic white dwarfs, if confirmed,would possess relatively low magnetic field strengths (B_WD < 10 MG) that aresimilar to those of intermediate-Polars but are much less than the averagefield strength of the current Polar population. Additional observations ofthese systems are required to definitively cast the white dwarfs as magnetic.Even if these two systems prove to be the first evidence of detached magneticwhite dwarf + M dwarf binaries, there is still a large disparity between theproperties of the presently known cataclysmic variable population and thepresumed close binary progenitors.

New Close Binary Systems from the SDSS-I (Data Release Five) and the Search for Magnetic White Dwarfs in Cataclysmic Variable Progenitor Systems