Labor is keeping a strong lead over the Coalition on a two-party preferred basis, according to today’s Essential Report poll.

Labor has maintained its primary vote and the Coalition has moved up marginally to 39% — but not quite enough to change Labor’s 55-45% 2PP lead in the poll taken just before and after the calling of the election on Saturday.

The Greens continue to perform strongly, maintaining 13% of the primary vote.  This morning, the ALP and the Greens announced a preference deal this morning covering the Senate and several House of Representatives seats (according to one media outlet, 50 seats).

Julia Gillard has strengthened her approval rating to 52%, and while her total disapproval rating has also increased to 30% since July 5, she still has a net approval level of 22 points.

There is some good news for Tony Abbott, who has improved on his dismal approval ratings of earlier this month.  His numbers have improved since July 5: approval of his performance is 40%, disapproval 44%, net approval level -4 points.

However, Gillard has extended her already significant lead as Preferred Prime Minister, picking up four points to move to 53%, while Abbott has lost three points and now has less than half Gillard’s numbers, 26%.

Essential also asked voters to identify the issues that would be most important for them in deciding how they would vote.  Economic management remains the key issue, identified by 38% of voters as the most important (and 63% overall nominated it as one of their top three issues). Health is second, identified by 16% of voters — more than when the same question was asked back in May (it was 55% overall as a top 3 issue).  It’s a distant third for protecting jobs — 7% and 24% overall, down five points since May. Treatment of asylum seekers does not rate as a potential vote changer — only 4% of voters said it was their most important issue, and 11% nominated it as one of their top three (although the accepted wisdom is that those voters are swinging voters in marginal seats). That puts it below issues such as leadership (6%), the environment (5%) and on the same level as tax and climate change.

Managing population growth was identified by only 1% of voters as their key issue, although 12% overall nominated it, the same as back in May.

There’s mixed results for the parties on perceptions of who is best at handling these key issues.  The Opposition still leads Labor on economic management, but the gap is six points (38% say the Liberals can best be trusted to manage the economy, 32% say Labor) and there are a lot of Don’t Knows. Labor has a strong 11-point lead on health, 37-37%, but with even higher Don’t Knows. On jobs, however, Labor has a massive lead, 42-28%.

But tellingly, both sides are about the same on addressing climate change (18-16%), and the Greens are way ahead — 36% of voters trust the Greens to best handle climate change.  The Greens also lead on “protecting the environment” and “ensuring a quality water supply”. Labor also has a big lead on education — 41-25% and IR (45-24%).  The Coalition’s biggest leads are on national security — 30-25%, and asylum seekers, 29-23%.