1954 United States elections
Dwight Eisenhower was still popular midway through his first term, and his Republicans lost both the House and the Senate anyway, which makes this the best answer here to anyone who treats a midterm as a simple verdict on the president. Sam Rayburn took the Speaker's chair and Lyndon Johnson the Senate leadership. Democrats would hold the House for the next 40 years, and in 1956 Ike won a landslide re-election without his party carrying either chamber, something that had happened only once before, in 1848.
More about 1954 United States elections