Incumbent Democratic President Bill Clinton was not eligible to serve a third term, and Vice President Gore was able to secure the Democratic nomination. Bush was seen as the early favorite for the Republican nomination, and despite a contentious primary battle with Senator John McCain and other candidates, secured the nomination by Super Tuesday. Many third-party candidates also ran, most prominently Ralph Nader. Bush chose former Secretary of Defense Dick Cheney as his running mate, and Gore chose Senator Joe Lieberman as his. Both candidates focused primarily on domestic issues, such as the budget, tax relief, and reforms for federal social insurance programs, though the foreign policy was not ignored. Clinton and Gore did not often campaign together, a deliberate decision resulting from the Lewinsky scandal two years prior.