Sousa won the riding of Mississauga South in the 2007 provincial election, defeating incumbent Tim Peterson. Formerly a Liberal, Peterson had crossed the floor in March 2007 to join the Progressive Conservative Party of Ontario (PC Party).
Sousa won the riding of Mississauga South in the 2007 provincial election, surpassing incumbent Tim Peterson. As a former Liberal, Peterson switched parties in March 2007 to join the Progressive Conservative Party of Ontario (PC Party).