The fate of Prime Minister Kevin Rudd will go down to swing voters and preferences, his Liberal National Party rival Bill Glasson says.
"It is probably a line ball," Dr Glasson said Saturday.
"The reality is there is probably seven or eight per cent of voters still undecided this week and my fate and Mr Rudd's fate lies in their hands.
"It is going to be extremely close and I think it is going to come down to preferences.
"It wouldn't surprise me if it is a late result."
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Mr Rudd was elected to the Brisbane seat of Griffith in 1998 and holds the seat by an 8.5 per cent margin.
"It is a huge swing. I'm not confident. I'm confident we worked hard and got out message out there," Dr Glasson said.
"To get it in the incumbent prime minister's seat makes it even harder, so I wouldn't draw any conclusions at the moment."
Dr Glasson, the former president of the Australian Medical Association, has lived in the electorate his entire life and believes some voters see the prime minister as an absent member.
He also expects a backlash over the economy and Labor's leadership changes.
"We've done a lot of door knocking and there is a clear feeling there that they have had enough and they want a change."
Dr Glasson spent the morning pressing palms and enjoying a barbecue with voters at Camp Hill, trying to make any difference he could before polls close.
LNP supporter Raymond Hawson just moved into the electorate and revelled in the chance to register his dissatisfaction with the government.
He wasn't voting against Mr Rudd, he said, but the Labor brand.
"They can't be trusted, they've gone against their word many times, it's just an absolute mess and an absolute joke," he said.
Many voters complained about being bombarded with letter drops and recorded phone messages, but Bryan Hodgson said it hadn't changed his support for Labor.
"It's not the individual I'm sticking with, it's the party and the macro things they've done: the apology, getting a seat on the UN Security Council, education reforms," he said.
"There have been mistakes but to me they haven't been major."
