Bordallo was married to Ricardo Bordallo, who served as Governor of Guam from 1975 to 1979 and from 1983 to 1987. While serving as first lady, she worked to emphasize the arts in the classroom and to increase awareness of the local Chamorro culture. Bordallo's husband, the former governor, committed suicide in 1990 when his appeals were unsuccessful and convictions of witness tampering and conspiracy to obstruct justice would require incarceration in federal prison. Bordallo was the first woman Democrat to be elected to the Guam Legislature, and served five terms as a senator from 1981 to 1982 and again from 1986 to 1994. During the 1988 U.S. presidential election, Bordallo was a member of Guam's uncommitted delegation to the 1988 Democratic National Convention.