A victory Sunday would give Abe's Liberal Democratic Party and junior partner New Komeito control of both houses of parliament an elusive goal for the government in recent years making it easier to pass legislation at a time when Japan faces huge structural challenges, including a rapidly graying population and bulging national debt.
Reviving the long-stagnant economy is the top priority for voters, and Abe agrees. Aggressive monetary easing and public works spending the first two "arrows" of his three-pronged "Abenomics" economic program has so far borne some fruit, lifting the stock market, boosting business confidence and easing pressure on Japan's vital exporters by weakening the yen.
A convincing victory in Sunday's election, where half the 242 seats in the less powerful upper house of parliament are up for grabs, may also embolden Abe and his backers in the LDP to pursue a nationalistic agenda he had abandoned his first time in office in 2006-2007.
Under the campaign slogan "Recover Japan," the LDP promises to make Japan a muscular, gentle and proud country. It calls for a strong economy, strategic diplomacy and unshakable national security under the Japan-U.S. Alliance, which allows for 50,000 American troops to be stationed in Japan.
That message has resonated with some voters worried about tensions over territorial disputes with China and South Korea and widespread distrust of an increasingly assertive China. A recent survey by Pew Research Center showed that only 5 percent of Japanese have a favorable opinion of China.