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 |
| --- | --- | --- | --- | --- | --- |
| Tennessee 2 | Howard Baker, Sr. | Republican | 1950.0 | Re-elected | Howard Baker, Sr. (R) 68.9% Boyd W. Cox (D) 31.1% |
| Tennessee 4 | Joe L. Evins Redistricted from 5th | Democratic | 1946.0 | Re-elected | Joe L. Evins (D) Unopposed |
| Tennessee 4 | Albert Gore, Sr. | Democratic | 1938.0 | Retired to run for U.S. Senate Democratic loss | Joe L. Evins (D) Unopposed |
| Tennessee 5 | Percy Priest Redistricted from 6th | Democratic | 1940.0 | Re-elected | Percy Priest (D) 67.5% Homer P. Wall (R) 32.5% |
| Tennessee 6 | James Patrick Sutton Redistricted from 7th | Democratic | 1948.0 | Re-elected | James Patrick Sutton (D) Unopposed |
| Tennessee 7 | Tom J. Murray Redistricted from 8th | Democratic | 1942.0 | Re-elected | Tom J. Murray (D) Unopposed |
Question:
How many parties match the canididates listed as howard baker, sr. (r) 68.9% boyd w. cox (d) 31.1%?
Answer:
1.0