In his last year in office, Dupré, by then an elderly deaf man, spoke out against the Long intra-party challenger, Dudley LeBlanc of Abbeville through the Long newspaper, the Louisiana Progress.[3]
The emancipation of slaves reduced the Duprés' wealth from extraordinary to merely well above the local average. In the 1860 census, the family's wealth is listed at $70,000 (equivalent to US$2,373,778 in 2023); in 1870, that number had dropped to $5,500 (equivalent to US$132,521 in 2023).[4][5]
As was common at the time, Dupré read law outside of a university setting, working first in the office of the St. Landry Parish clerk of court. He was admitted to the bar in 1880 and established his law office in Opelousas. In 1887, Dupré was a member of the Louisiana state militia and was on active duty at the time of a riot in Morgan City in St. Mary Parish. He was a member of the Masonic lodge, the Benevolent and Protective Order of Elks, and the Roman Catholic Church.[6]
From 1888 to 1992 and again from 1913, to fill the seat vacated by A. H. Garland, who left the state, until 1932, Dupré was a Democratic member of the Louisiana House of Representatives.[7] He served as a state district court judge by election from 1896 to 1900 and by appointment in 1914. He was elected judge in 1916, 1920, and 1924, while he also served in the part-time legislative post. Such dual office-holding is no longer permitted. Judge Dupré, as he was long known, was a member of the Louisiana Constitutional Convention of 1921.[1] In his second stint in the legislature, his successors included his son-in-law, Felix Octave Pavy, a prominent St. Landry Parish physician and an uncle by marriage of Dr. Carl Weiss, the assassin of U.S. SenatorHuey Pierce Long, Jr.[7]
The editor of the former New Orleans Item referred to Representative Dupré's steadfast opposition to tax increases:
There was a statesman in Tennessee who attributed his popularity to the fact that he had never voted for a tax or against an appropriation. We might almost say of Judge Dupré that we do not recall his ever having voted for a tax increase, salary increase, or for an increased appropriation.
The position of the twelfth man in opposition to eleven stubborn jurors is one which the judge is not afraid to take in a world which loves to have unanimous action and where kickers are generally made uncomfortable.[8]
In 1881, Dupré married Julia B. Estilette (1860–1944) of Opelousas, the daughter of his law partner, E. D. Estilette. She was born in New Haven, Connecticut, where her father was attending Yale University. E. D. Estilette was a judge and in 1876 the Speaker of the Louisiana House of Representatives. The couple had four children, including twin daughters, a son, and a third daughter. He was a member of the Benevolent and Protective Order of Elks. Dupré outlived his wife by two years. They are interred along with other family members at the Myrtle Grove Cemetery in Opelousas.[1]
To retaliate against Dupré, Long had a hole drilled in the roof directly above Dupre's office in the Old Louisiana State Capitol to punish Dupré for the lawmaker's opposition to a new capitol building. When he demanded that Governor Huey Long repair the problem at once, Long said that he would do so only if Dupré would vote for the planned new Louisiana State Capitol building, to be built in skyscraper format. When Dupré refused to commit his vote, Long told him, "Die, damn you, in the faith!"[3]
Long then noted that Dupré "was much amused and almost came over."[3]
