Look at how the opposition candidates portray themselves to the public.
In 2011, the hot favorite Nicole Seah from NSP vs Tin Pei Ling. What happened after the GE2011, Nicole Seah chickened out, sighting cannot take stress, etc while Tin Pei Ling persisted on despite all the critics. Tin Pei Ling deserved the landslide victory at MacPherson in this GE2015. She has shown the residents of MacPherson and other Singaporeans that she is determined, perseverance, etc compared to Nicole Seah.
Now in GE2015, our dear WP Lim Li Lian from Punggol East who had lost to Charles announced that she won't take up the NMP position and would retire from politics by becoming a full time homemaker. What does this say about her and her party? Extreme negative. Just because of 1 defeat, and you chickened out. This clearly showed that you do not mean what you said, that is to serve the people. You have let the voters down who have supported you in this GE even though you didn't win.