Walpole ya bar Castle Rising a shekara ta 1702 don ya iya wakiltar maƙwabta na King's Lynn, wani aljihu wanda zai sake zabar shi don sauran aikinsa na siyasa. Masu jefa kuri'a da 'yan siyasa sun kira shi "Robin".Kamar mahaifinsa, Robert Walpole ya kasance memba na Jam'iyyar Whig. A shekara ta 1705, Sarauniya Anne ta nada Walpole ya zama memba na majalisar don mijinta, Prince George na Denmark, Lord High Admiral. Bayan da aka nuna shi a cikin gwagwarmaya tsakanin Whigs da gwamnati, Walpole ya zama matsakaici don sulhunta gwamnati ga shugabannin Whig.
Janairu 1701