file/Associated Press

Mitt (left) and Scott Romney watched their father exhort moderates at the 1964 Republican National Convention.

Charles Dharapak/Associated Press

Mitt Romney shifted to the right, said one adviser, in part because there was “no way” to win the nomination as a moderate.

Associated Press/File 1962

On the day that George Romney declared his candidacy for governor, Mitt was there, absorbing his father’s views.

Bettman/Corbis/Associated Press

George Romney opposed what he called “extremism” in the GOP’. Mitt Romney is behind his father, in plaid.

Globe Staff/File 1994

In the face of the GOP’s increasingly powerful conservative wing, Romney ran as a moderate against Senator Ted Kennedy in 1994.