Selecting respondents in the High Street on a Monday would include an excessive proportion of women of child-bearing age unless the quotas are strictly adhered to.
The respondents came from national and local organizations as well as Internet-only news companies and included correspondents, senior editors, producers and media executives.
The respondents included Republicans and Democrats, moderates, liberals and conservatives.
The respondents to Quinnipiac's poll, which had a margin of sampling error of 3 percentage points, may have included a greater share of Republicans than the voting public, however.
The respondents included whites and African-Americans.
Analysts have noted that respondents favoring all-party talks in the opinion poll also included a strong majority of Protestant Unionist voters.
Bayan chair Carol Araullo said the respondents will include members of the Anti-Terrorism Council headed by Executive Secretary Eduardo Ermita and Raul Gonzalez.
The 53 respondents were from the Washington, DC area and included 43 Lutheran clergy and seminarians, one Roman Catholic and one Jewish clergyman, and an evangelical minister.
The 14 respondents (46%) who could not decide included the 10 informants who said they sometimes read SF.