Quebec's political leaders will gather tonight for the first of their potentially decisive live TV debates.

The Liberals' Philippe Couillard, Francois Legault of the Coalition Avenir Quebec, Jean-Francois Lisee of the Parti Quebecois and Quebec solidaire's Manon Masse will all be trying to woo voters ahead of the Oct. 1 election.

They will debate four topics: health, education, the economy, and identity politics, including immigration and the national question.

Health and immigration levels have been two of the hot-button issues since Couillard launched the 39-day campaign Aug. 23.

The French-language debate will begin at 8 p.m. eastern and will be followed by two other televised debates -- one in English next Monday and another in French on Sept. 20.

One recent poll found that 44 per cent of respondents who had a preference said they could change their minds based on the performances in the debates