The Ipsos Reid telephone poll of 1,003 adults for the Canwest News Service and Global TV found Liberal support fell one percent from a similar poll last month.
Support also fell for the minority Conservative government under Prime Minister Stephen Harper, down three percent to 37 percent, the poll showed.
However, the socialist New Democratic Party surged six percent to 19 percent national support. The Green Party had 10 percent of respondents' favor, while the separatist Bloc Quebecois had nine percent.
The Liberals' showing is the lowest for the party since Michael Ignatieff became leader last December, the pollster said.
The Conservatives are 10 seats short of a parliamentary majority, with 145 of the 308 seats. The Liberals have 77, the Bloc Quebecois 48, the NDP 37 and there is one independent.
The poll was conducted Nov. 17-19 and has a 3.1 percentage point margin of error, Ipsos Reid said.