Mr Png said his "ground level" campaign strategy will be to do a lot of walkabouts and to meet residents in many parts of the ward, such as at void decks, shops and bus stops.

Several PAP heavyweights, such as National Development Minister Khaw Boon Wan and Education Minister Heng Swee Keat, turned up at SRJC.

From the WP, Mr Low - who is now an Aljunied GRC MP - and the constituency's other MPs - Mr Chen Show Mao, Mr Muhamad Faisal Abdul Manap, Mr Pritam Singh and Ms Sylvia Lim - were spotted as well.

Mr Khaw said Mr Choo described himself as a "hao seh kia", which means a young man in Teochew, but he is "very mature and competent".

On Dr Poh's unexpected showing as a possible candidate for the by-election, Mr Low told reporters that "Png Eng Huat is the only candidate that the party supports" and there is "no backup".

Mr Choo and Mr Png also spoke about how important their wives were to them. On his wife, civil servant Pamela Lee, 30, Mr Choo said: "To me, it's not food, it's not breakfast, but it's the moment I wake up in the morning and see my wife beside me. I think that kiss in the morning before I leave for work...that keeps me going every single day."

The couple were married two months after last year's General Election. Mr Choo also said that his wife was at the nomination centre yesterday to support him, but did not know if she could join him on the campaign trail due to work commitments.

In the lead-up to Nomination Day, Mr Png said he spent time with his wife in the evenings, assuring his family that he would still spend time with them to go jogging and have meals.

He said it was "important" that he spotted his wife in the crowds at SRJC, and he waved to her.

They have been married for 12 years and have a daughter and a son.

The two sites designated by police for election rallies are Hougang Stadium and the open field in front of Block 837.

Police confirmed that there will be no election rallies today.

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