Member for Keira Ryan Park says Election Day is always "never-wracking, no matter how many times you do it".
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"It's always humbling," he said.
"I know I've done the best I can over the past four years for the community I represent, and that's what I hope to do after this evening."
Mr Park and wife Kara Lamond cast their votes at Corrimal High School at 11am.
Mr Park is seeking a third term in Keira.
As for whether there was a sense of a shift towards a change in government, the Labor MP said it was "hard to tell".
"There's a lot of people who are very supportive of me, but what happens across the state is in the lap of the gods," he said.
"We'll see that when the votes start coming in.
"There's a good feel out there (with other Labor MPs and candidates), but this is a big task to win from Opposition. The gap we've got to overcome is not easy, and it's going to take a massive effort.
"I'm very happy with the policies that Michael Daley has put forward, but it'll still require a big effort by the whole team."
Mr Park is Shadow Treasurer, Shadow Minister for Infrastructure and Shadow Minister for the Illawarra.
When asked how his role could change if Labor wins government, Mr Park said "that'll be a decision for Michael Daley to make as the leader".
"I've really enjoyed being the Shadow Treasurer, and I look forward to becoming the state's next Treasurer if the people of NSW elect a Labor government, but that's still a long way away and a lot of water to go under that bridge," he said.
"My most important job is always the Member for Keira. They're the people who elected me to the NSW Parliament and that's the people who I always prioritise."
Voters have their say
While at Corrimal High School, the Mercury spoke to some residents about how they voted and why.
Towradgi resident Ben Parsons, 35, voted for Labor.
"They're just the way to go - no particular reason," he said. "I put Liberals last - that was my main objective."
Corrimal resident Greg Cook, 62, voted Liberal.
"It's because of the job Gladys is doing, and all the money she's putting into infrastructure, roads and schools," he said. "And she's honest."
Corrimal's Wendy Hadfield, 77, voted for Ryan Park.
"I think he's been doing a good job, and he's a gentleman when he meets you in the street - he acknowledges you," she said.