During the 1968 presidential campaign, for what group did richard nixon cast himself as the spokesperson?

The Silent Majority!

Explanation:

Richard Milhous Nixon was an American lawyer and politician who served as the 37th President of the United States from 1969 until 1974, when he became the first and only President to resign from office. Prior to that he had been a member of the House of Representatives and Senator for the State of California, as well as the 36th Vice President of the United States between 1953 and 1961 under Dwight D. Eisenhower.

Nixon's Democrat opponent in the general election was Vice President Hubert Humphrey, a former Minnesota Senator who was named at a convention marked by violent protests. Throughout the campaign, Nixon portrayed himself as a figure of stability during a period of national turmoil and turmoil. He became a spokesman for what he later called the "silent majority" of socially conservative Americans who did not like the hippie counter-culture and anti-war protesters.