It is predicted Labor will struggle to hold onto the northern seats of Bass and Braddon in September's poll.
The Prime Minister has announced Australians will go to the polls on September 14.
Julia Gillard says revealing the date months in advance removes speculation about the election.
Political commentator Richard Herr says the announcement is a huge surprise.
"This is three times longer than the longest campaign we've had."
Dr Herr says a question mark hangs over whether Labor's Geoff Lyons (Bass) and Sid Sidebottom (Braddon) can cling to power in Tasmania's northern electorates.
They are both facing a challenge from Liberal candidates; Andrew Nikolic (Bass) and Brett Whiteley (Braddon).
The Opposition failed to win a single Tasmanian seat in the House of Representatives in 2010, a dismal statistic it is keen to avoid repeating.
"They would expect, just on the polling, to get the two northern seats back," Dr Herr said.
"If they don't do that, there would be serious questions asked about the state administration."
While a question mark hangs over Bass and Braddon, Dr Herr says the Hobart-based electorate of Denison will be "fascinating" to watch as Labor tries to wrestle the seat back.
Polling suggests sitting Independent Andrew Wilkie (Denison) and Labor's Julie Collins (Franklin) and Dick Adams (Lyons) will all retain their seats.
"Certainly Denison will be fascinating," Dr Herr said.
"Tony Windsor has shown that an Independent can hold onto a seat if the two major parties are either weak or unable to produce qualities candidates."
Labor candidate Jane Austin will attempt to win back the seat which the party lost in 2010.
Anna Reynolds is standing for the Greens and the Liberals hope to reveal their candidate next month.
Six Tasmanian Senate seats will also be up for grabs in September.
They are currently held by Lin Thorp (ALP), Carol Brown (ALP), Catryna Bilyk (ALP), Richard Colbeck (Libs) David Bushby (Libs) and Peter Whish-Wilson (Greens).