NSW Labor leader Chris Minns has slumped to his lowest level as preferred premier since winning government, while half of all voters are undecided about who they would want to lead the state.

At the same time, NSW Liberal Leader Mark Speakman has reached his highest popularity rating since he took over the leadership of the Coalition, rising 3 percentage points to 19 per cent.

The exclusive results in the Resolve Political Monitor coincide with the final sitting period of the year, which will see Speakman fighting to hold on to his job as some in the Liberals are convinced that a change in leadership is the only option to turn around consistently poor polling.

Speakman will also have to navigate a potential split with the NSW Nationals on energy policy, as the state arm of the party mul

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