In 1962, Watson first ran for
South Carolina's 2nd congressional district seat in the U.S. House to fill the opening created when fellow Democrat
John J. Riley died on New Year's Day. His wife,
Corinne Boyd Riley, had won a special election to serve out the remainder of the term, but did not run for a full term in November. After securing the Democratic nomination, Watson faced
Floyd Spence, a fellow state representative from neighboring Lexington County, who had turned Republican a few months earlier. The ensuing
general election was far closer than expected, with Watson winning by only five percentage points. He received crucial support from his mentor,
U.S. Senator Strom Thurmond. Like Thurmond, Watson was an open and unashamed
segregationist. Both supported
Barry Goldwater's campaign for President. While Watson headed the South Carolina "Democrats for Goldwater" organization, Thurmond went as far as
switching parties and becoming a Republican on September 17, 1964. Partly because of his support for Goldwater, Watson was reelected without opposition as Goldwater carried South Carolina, the first Republican to have done so since
Rutherford B. Hayes in 1876. The House Democratic Caucus stripped Watson of his seniority for supporting Goldwater. Another Deep South congressman,
John Bell Williams of
Mississippi, lost his seniority for supporting Goldwater as well. Declaring he would "not sit around and be bullied by northern liberals," Watson resigned from Congress on February 1, 1965. He then announced that he would run in the
special election for his old seat on June 15, 1965—as a Republican. Watson won the special election with 59.1 percent of the vote to become the first Republican to represent South Carolina in the House since 1896, and the first Republican to win a disputed House election in the state since
Reconstruction. It was a different Republican Party in the South, however, as in 1965 most blacks in South Carolina were still effectively
disenfranchised. Watson was comfortably reelected in 1966 and 1968. Watson's opposition to
civil rights legislation exceeded that of most other Southern Republicans. For instance, he was the only House Republican to vote against the Jury Selection Act of 1968, a civil rights measure intended to eliminate racial discrimination in jury selection. ==1970 gubernatorial election==