But while nearly half of Ms Bennett's Henderson supporters voted at Western Heights School, voters weren't quite as convinced at two other centres where the votes were equally split between her and Ms Sepuloni. They were Henderson High School (315 each) and Trusts Stadium (27 each).
Ms Bennett was also popular in Swanson where she won by 549 votes.
However, things balanced out because of Ranui voters.
Ms Sepuloni had 871 more supporters there than Ms Bennett and polled better at each of the suburb's four centres.
Ms Sepuloni was also popular in Glen Eden where she took a 798 lead.
On election night Ms Sepuloni led the race for a good part of the evening but as the night progressed and the results from the final few booths came in, things leapt in Ms Bennett's favour.
At one stage she was 1000 votes ahead but the final booth changed that back to just 349 votes.
Former West Auckland mayor Bob Harvey believed both women had worked hard for their votes and had done well.
He said the west was traditionally a very red area, but things had changed in the past 10 or so years and that was now reflected in people's political views.
"The west was once struggle country and now it's more affluent, it's more positive and it's very comfortable in its skin ... and with that comes a change of political values. They tend to think that maybe the class of National feels more comfortable with their newfound status."
However, he said there were still very strong pockets of Labour supporters in the west, but no vote was a given and Ms Sepuloni still had to work hard for each of the votes she did get.
He thought part of that was being able to relate to the strong Pacific and Maori community, especially in suburbs like Ranui, where she did well.