In this report we discuss the impact of polarized foregrounds on a future CMBPol satellite
mission. We review our current knowledge of Galactic polarized emission at microwave
frequencies, including synchrotron and thermal dust emission. We use existing data and our
understanding of the physical behavior of the sources of foreground emission to generate
sky templates, and start to assess how well primordial gravitational wave signals can be
separated from foreground contaminants for a CMBPol mission. At the estimated foreground …