If those predictions hold true, the Senate's political leanings would tip toward Mr. Aquino and away from Mr. Binay.

WSJ: Philippine Midterm Vote Sets Stage for 2016

If his election slate does better than expected, Mr. Binay will have shown his vote-getting prowess and fine-tuned his political machine.

WSJ: Philippine Midterm Vote Sets Stage for 2016

Mr. Binay is known for his personal touch, sending cakes to senior citizens on their birthdays, for example, and for his self-deprecating humor, such as joking about his 5 foot-2-inch height.

WSJ: Philippine Midterm Vote Sets Stage for 2016