After receiving his law degree, Daniel moved to
Liberty, Texas, and began his legal practice there, where he was also elected Justice of the Peace for
Liberty County. In 1968, at age 27, he was elected to the
Texas House of Representatives from the same seat his father had held from 1939 to 1945. After the fallout from the
Sharpstown scandal, with those connected being voted out of office, there was a 50% turnover in both houses of the Texas Legislature. On January 9, 1973, Price Jr. was unanimously elected Speaker of the House by his fellow Democratic Party state representatives, who had
a 133 to 17 majority over the Republican Party in the House. Under Daniel's leadership, the reform-minded
Sixty-third Texas Legislature passed new ethics, financial disclosure, and open-records laws. The Legislature also updated and strengthened open-meetings, and lobbying laws. He believed that it should be illegal for the speaker to offer favors or make threats in order to get votes. Because of the great power of the office, Daniel believed that no speaker should be elected for more than one term, and consequently he did not seek reelection in 1974. There had been talk of Price Jr. running for Governor in 1974, but he was apparently not interested. Price Jr. served as president of the 1974 Texas Constitutional Convention, the first since the Constitution was established in 1876. He relented on a right-to-work compromise to appease the conservatives, and in doing so, lost his base of the liberal labor force. The 1974 convention to revise the state constitution was not a success. Further alienating his support base, Price Jr held a press conference blaming organized labor, and specifically what he saw as its manipulation of racial minority delegates, for the convention's failure. In 1978, Daniel unsuccessfully sought the Democratic nomination for
Texas Attorney General, losing to eventual general election winner
Mark White. ==Personal life and death==