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 |
| --- | --- | --- | --- | --- | --- |
| Illinois 2 | Barratt O'Hara | Democratic | 1948.0 | Lost re-election Republican gain | Richard B. Vail (R) 53.6% Barratt O'Hara (D) 46.4% |
| Illinois 3 | Neil J. Linehan | Democratic | 1948.0 | Lost re-election Republican gain | Fred E. Busbey (R) 57.2% Neil J. Linehan (D) 42.8% |
| Illinois 6 | Thomas J. O'Brien | Democratic | 1942.0 | Re-elected | Thomas J. O'Brien (D) 64.6% John M. Fay (R) 35.4% |
| Illinois 15 | Noah M. Mason | Republican | 1936.0 | Re-elected | Noah M. Mason (R) 63.3% Wayne F. Caskey (D) 36.7% |
| Illinois 20 | Sid Simpson | Republican | 1942.0 | Re-elected | Sid Simpson (R) 59.3% Howard Manning (D) 40.7% |
| Illinois 25 | Melvin Price | Democratic | 1944.0 | Re-elected | Melvin Price (D) 64.9% Roger D. Jones (R) 35.1% |
Question:
What party does sid simpson represent?
Answer:
Republican