Zell Bryan Miller (February 24, 1932 - March 23, 2018) was an American author and politician from the U.S. state of Georgia. A Democrat, Miller served as lieutenant governor from 1975 to 1991, 79th Governor of Georgia from 1991 to 1999, and as U.S. Senator from 2000 to 2005. Miller was a conservative Democrat. In 2004, he supported Republican President George W. Bush against the Democratic nominee John Kerry in the presidential election.

Miller was elected governor of Georgia in 1990, defeating Republican Johnny Isakson (who later became his successor as U.S. Senator) after defeating Atlanta Mayor Andrew Young and future Governor Roy Barnes in the primary. Miller campaigned on the concept of term limits and pledged to seek only a single term as governor. He later ran for and won re-election in 1994. James Carville was Miller's campaign manager.  In 1991, Miller endorsed Governor Bill Clinton of Arkansas for President of the United States. Miller gave the keynote speech at the 1992 Democratic National Convention at Madison Square Garden in New York City. In two oft-recalled lines, Miller said that President George H. W. Bush "just doesn't get it," and he remarked of a statement by Vice President Dan Quayle:  As governor, Miller was a staunch promoter of public education. He helped found the HOPE Scholarship, which paid for the college tuition of Georgia students who both established a GPA of 3.0 in high school and maintained the same while in college, and who were from families earning less than $66,000 per year. The HOPE Scholarships were funded by revenue collected from the state lottery. In December 1995, his office announced a proposal for $1 billion more in spending on education. HOPE won praise from national Democratic leaders. The HOPE Scholarship program still to this day provides Georgia students with an opportunity to attend a public college or university, who otherwise may have no opportunity to do so.  Upon leaving the governor's office in January 1999, Miller accepted teaching positions at Young Harris College, Emory University, and the University of Georgia. He was a visiting professor at all three institutions when he was appointed to the U.S. Senate.

Answer the following question by taking a quote from the article: Was he a republican or democrat
Miller gave the keynote speech at the 1992 Democratic National Convention at Madison Square