In 1990, Bullock was elected Lieutenant Governor, having defeated the 40-year-old Republican nominee, businessman Robert Mosbacher Jr., of Houston, the son of the sitting United States Secretary of Commerce Robert Mosbacher. Bullock received 2,002,360 votes (51.69 percent) to Mosbacher's 1,741,893 votes (44.97 percent); he took office on January 15, 1991, as Democrat Ann W. Richards became the state's second female governor. In 1994, Bullock was easily elected to a second four-year term over Republican Harold "Tex" Lezar; Bullock received 2,631,843 votes (61.48 percent) to Lezar's 1,648,848 votes (38.52 percent). Bullock was inaugurated for his second term on January 17, 1995, while Republican George W. Bush was sworn in as Texas's 46th governor, having unseated Ann Richards. Bullock did not seek election to a third term in 1998; he was succeeded by Republican Agriculture Commissioner (and later Governor) Rick Perry on January 19, 1999.