Fresh headache for embattled Australia PM after poll loss

Embattled Australian Prime Minister Malcolm Turnbull's grip on power ahead of upcoming national polls was under renewed scrutiny today after disappointing by-election results.

Five seats were up for grabs after four opposition politicians and one from a minor party fell foul of a constitutional rule barring dual citizens from serving in parliament.

Yesterday's by-elections were billed as a key test for Turnbull and Labor opposition leader Bill Shorten, with the governing Liberal-National coalition hoping to win a seat to double its wafer-thin parliamentary majority of one.

With Labor tipped to retain all four of its seats, including two that had been seen as too close to call -- Longman in Queensland state and Braddon in Tasmania state -- Shorten emerged as the clear winner.

"These by-elections were a very simple question -- did people want more of the same or did they want better from their government," Shorten told reporters in Queensland on Sunday.

"I think, in large numbers, they said we want better from the government... We had the better candidates (and) the better policies."
"I assure you, when we come to the federal campaign, Australians will see there is a very clear choice then... We will look very seriously and thoughtfully and humbly at the way in which the voters have responded."