In 1986, Hayes was elected to the United States House of Representatives as a Democrat to fill the seat vacated by John Berlinger Breaux.[1] In 1990, Hayes again defeated David Thibodaux. The tally was 103,308 (58 percent) for Hayes, 68,430 (38 percent) for Thibodaux, and 7,364 (4 percent) for another Democrat, Johnny Myers. In 1992, Hayes as a Democrat defeated his own brother, Fredric Hayes, a Republican, with whom he had quarreled. Hayes received 84,149 (73 percent) to his brother's 23,870 (21 percent). A second Republican, Robert J. "Bob" Nain, polled 7,184 votes (6 percent).
In 1997, when Hayes retired from the House after unsuccessfully running for the Senate, his House seat was taken by Democrat Chris John of Crowley in Acadia Parish.
Hayes continues to be politically involved as a lobbyist.[2] He appeared at a December 2008 event to raise funds for the successful reelection in 2010 of Republican U.S. Senator David Vitter.[3]