In 1968, Cameron contested the safe Labor House of Assembly seat of Millicent for the Liberal and Country League (LCL) after objecting to the views of incumbent Des Corcoran on road transport control.
[2] Early in 1969, Senator Keith Laught died suddenly and Cameron was nominated by Premier Steele Hall as his replacement.
He became an important ally of Steele Hall (then Leader of the Opposition), representing the increasingly visible moderate forces within the party.
Although some Liberal Movement members, such as future Premiers David Tonkin and Dean Brown, decided to remain in the LCL, Cameron left with Hall and Millhouse.
In 1976, Cameron and Hall rejoined the Liberal Party, while Millhouse initially formed the New LM before helping found the Australian Democrats.