Medicaid is a government program and Obamacare plans are offered through private health insurance companies. The word Obamacare is used to describe polices obtained through an Affordable Care Act (ACA) health exchange.
JFk ran against Republican candidate Richard Nixon for the 1960 presidential election.
Nixon ran against Herbert Humphrey in 1968. Humphrey was the  incumbent vice president and the Democratic hopeful for that  election period.