Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| District | Incumbent | Party | First elected | Result | Candidates |
| --- | --- | --- | --- | --- | --- |
| Texas 1 | Wright Patman | Democratic | 1928.0 | Re-elected | Wright Patman (D) 67.3% James Timberlake (R) 32.7% |
| Texas 2 | Jack Brooks | Democratic | 1952.0 | Re-elected | Jack Brooks (D) 68.7% Roy James, Jr. (R) 31.3% |
| Texas 4 | Ray Roberts | Democratic | 1962.0 | Re-elected | Ray Roberts (D) 72.0% Conner Harrington (R) 28.0% |
| Texas 5 | Bruce R. Alger | Republican | 1954.0 | Re-elected | Bruce R. Alger (R) 56.3% Bill Jones (D) 43.7% |
| Texas 6 | Olin E. Teague | Democratic | 1946.0 | Re-elected | Olin E. Teague (D) Unopposed |
| Texas 7 | John Dowdy | Democratic | 1952.0 | Re-elected | John Dowdy (D) 88.2% Raymond Ramage (R) 11.8% |
| Texas 9 | Clark W. Thompson | Democratic | 1947.0 | Re-elected | Clark W. Thompson (D) 66.3% Dave Oaks (R) 33.7% |
| Texas 10 | Homer Thornberry | Democratic | 1948.0 | Re-elected | Homer Thornberry (D) 63.3% Jim Dobbs (R) 36.7% |
| Texas 11 | William R. Poage | Democratic | 1936.0 | Re-elected | William R. Poage (D) Unopposed |
| Texas 12 | Jim Wright | Democratic | 1954.0 | Re-elected | Jim Wright (D) 60.6% Del Barron (R) 39.4% |
| Texas 15 | Joe M. Kilgore | Democratic | 1954.0 | Re-elected | Joe M. Kilgore (D) Unopposed |
| Texas 16 | J. T. Rutherford | Democratic | 1954.0 | Lost re-election Republican gain | Ed Foreman (R) 53.8% J. T. Rutherford (D) 46.2% |
| Texas 17 | Omar Burleson | Democratic | 1946.0 | Re-elected | Omar Burleson (D) Unopposed |
| Texas 18 | Walter E. Rogers | Democratic | 1950.0 | Re-elected | Walter E. Rogers (D) 58.8% Jack Seale (R) 41.2% |
| Texas 19 | George H. Mahon | Democratic | 1934.0 | Re-elected | George H. Mahon (D) 67.1% Dennis Taylor (R) 32.9% |
| Texas 20 | Henry B. Gonzalez | Democratic | 1961.0 | Re-elected | Henry B. Gonzalez (D) Unopposed |
| Texas 21 | O. C. Fisher | Democratic | 1942.0 | Re-elected | O. C. Fisher (D) 76.1% E. S. Mayer (R) 23.9% |
| Texas 22 | Robert R. Casey | Democratic | 1958.0 | Re-elected | Robert R. Casey (D) 53.5% Ross Baker (R) 46.5% |
Question:
what is the political affiliation of ray roberts
Answer:
Democratic