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 |
| --- | --- | --- | --- | --- | --- |
| Massachusetts 1 | Silvio Conte | Republican | 1958.0 | Re-elected | Silvio Conte (R) 72.9% Mary L. Wentworth (D) 27.1% |
| Massachusetts 2 | Edward Boland | Democratic | 1952.0 | Re-elected | Edward Boland (D) 68.7% Thomas P. Swank (R) 31.3% |
| Massachusetts 4 | Barney Frank | Democratic | 1980.0 | Re-elected | Barney Frank (D) 74.2% Jim Forte (R) 25.8% |
| Massachusetts 5 | James Shannon | Democratic | 1978.0 | Retired to run for U. S. Senate Democratic hold | Chester G. Atkins (D) 53.4% Greg Hyatt (R) 46.6% |
| Massachusetts 7 | Ed Markey | Democratic | 1976.0 | Re-elected | Ed Markey (D) 71.4% S. Lester Ralph (R) 28.6% |
| Massachusetts 8 | Tip O'Neill | Democratic | 1952.0 | Re-elected | Tip O'Neill (D) 91.9% Laura Ross ( C ) 8.1% |
| Massachusetts 9 | Joe Moakley | Democratic | 1972.0 | Re-elected | Joe Moakley (D) Unopposed |
| Massachusetts 10 | Gerry E. Studds | Democratic | 1972.0 | Re-elected | Gerry E. Studds (D) 55.7% Lewis Crampton (R) 44.3% |
Question:
What is the minimum first elected for ed markey?
Answer:
1976.0