(Bloomberg) -- Millions of Philippine voters are headed to midterm elections on May 13 to vote for new lawmakers who will determine the fate of President Rodrigo Duterte’s pitch to revamp the political and tax systems.

Duterte has put forward a controversial plan to shift his nation’s government system from unitary to federal, in a bid to spread wealth in one of Asia’s fastest-growing economies. He also wants to cut corporate tax rates to attract more investments. To do this, his allies must win majority of about 300 seats in the House of Representatives and the 12 Senate slots up for grabs in the midterm vote.

Pre-election surveys are looking good for Duterte. Ten of his chosen senatorial candidates have a shot at winning seats, based on an April survey by pollster Pulse Asia. He’s also expected to retain control of the House, whose members mostly aligned with his party after he won the presidency in 2016.

Here’s everything you need to know about the Philippine midterm vote.

By the Numbers

Prominent Personalities

• Senator Grace Poe - She’s one of the leading senatorial candidates based on pre-election surveys, and her ranking in the midterm vote could affect how she approaches the 2022 presidential elections after she lost to Duterte in 2016.

• Christopher “Bong” Go - He’s Duterte’s former top aide and pet candidate who has seen his ranking in pre-election polls boosted by the president’s backing. The outcome of his senatorial bid could be a good measure of Duterte’s popularity.
• Former Senator Mar Roxas - He’s the opposition’s main candidate in the midterm vote after placing second to Duterte in the last presidential elections. His ranking could be an indicator of the public’s sentiment toward the president’s critics.

• Governor Imee Marcos - A daughter of the late dictator Ferdinand Marcos, she’s trying to keep her family’s political ambitions alive through her senatorial bid, after her brother’s narrow defeat in the vice-presidential polls in 2016 and her mother Imelda’s recent conviction.
• Davao City Mayor Sara Duterte - She’s seeking re-election in her clan’s local turf, but she’s also making herself visible in the national political scene by campaigning for her father’s candidates and some of her own. Her name is already being floated by administration officials as her father’s potential successor in 2022.

Analysts’ Views

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