The anticipated victory would give the Japanese leader a mandate for his "Abenomics" recipe that aims to end prolonged stagnation with a mix of hyper-easy monetary policy, fiscal spending and structural reforms including deregulation.
Support for Japanese Prime Minister Shinzo Abe's government rose by 4.7 percentage points to two-thirds of voters in the month since his Liberal Democratic Party (LDP) returned to power, a poll by the Kyodo news agency showed on Sunday.
Japan is set to dissolve Parliament's Lower House on Friday for a election on December 16 that is likely to return the long-dominant Liberal Democratic Party (LDP) to power with a conservative former Prime Minister at the helm.
Embattled Japanese Prime Minister Yoshihiko Noda has suggested to his main rival he will call an election for early November, media reported on Thursday, but with the opposition scenting victory it was unclear if he could wait that long.
Unpopular Prime Minister Naoto Kan will likely resign on August 30, his economics minister said on Tuesday, but who will succeed him as Japan confronts a nuclear crisis and a long list of economic difficulties remained up in the air.
This may be Japanese prime minister Naoto Kan's last chance at redemption. Just days before the deadly calamity, Kan was on the verge of stepping down as PM. Takahide Kiuchi, economist at Nomura, spoke to CNBC-TV18's Menaka Doshi about the situation in Japan, the rebuilding process and the government in power.