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We propose a new precision measurement of parity-violating electron scattering on the proton at very low Q^2 and forward angles to challenge predictions of the Standard Model and search for new physics. A unique opportunity exists to carry out the first precision measurement of the proton's weak charge, Q_W =1 - 4sin^2θ_W. A 2200 hour measurement of the parity violating asymmetry in elastic ep scattering at Q^2=0.03 (GeV/c)^2 employing 180 μA of 85 determine the proton's weak charge witharXiv:1202.1255v2 fatcat:4jfnrcqzxzachjbcgbxawxg2ui