For 10 points, name this politician who sponsored a bill which would have banned slavery in any land gained from Mexico in the Mexican-American War, his namesake proviso.
This man lost to William F. Packer as the first Republican candidate for Governor of Pennsylvania. He also ran for Speaker of the House in 1849 as a candidate for the Free Soil Party, which was created partly as a result of the Democrats' rejection of a bill he sponsored. That bill, which was authored by Jacob Brinkerhoff, failed to be incorporated into the Treaty of (*) Guadalupe Hidalgo after it failed in the Senate. For 10 points, name this politician who sponsored a bill which would have banned slavery in any land gained from Mexico in the Mexican-American War, his namesake proviso.
This man lost to William F. Packer as the first Republican candidate for Governor of Pennsylvania.
David {Wilmot}