user: Question: How many times was the candidates Paul Tsongas (D) 60.6% Paul W. Cronin (R) 39.4%?
Columns: ['District', 'Incumbent', 'Party', 'First elected', 'Result', 'Candidates']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Massachusetts 1', 'Silvio Conte', 'Republican', 1958.0, 'Re-elected', 'Silvio Conte (R) 71.1% Thomas R. Manning (D) 28.9%']
SQL:

assistant: SELECT COUNT("Incumbent") FROM "Table" WHERE "Candidates" = 'Paul Tsongas (D) 60.6% Paul W. Cronin (R) 39.4%';