It is funny that TJS haters keep bringing in SDP, where TJS was member for only a few months.
If you believe that TJS is an opportunist (i sure do, as i believe all politicians to be opportunists), then you will see that TJS joined SDP only because of the GE. Now, I dont even care where this guy came from or how he suddenly popped up. We cannot afford that kind of consideration when the ruling party is fielding the likes of TPL, Janil, KeeChiuChan, etc. With PAP fielding monkeys, I dont mind voting for baboons. I dont even need to like baboons, disliking monkeys is good enough reason.
Right after the GE, there were speculations that TJS will be trying his luck for a COE for the PE, for no reason other than an excuse to exit SDP. When he received the COE, that came as a surprise, and support in the form of donations and volunteers flowed in. You can't fault the man for trying his luck. Again, all politicians are opportunists. Hell, how bad can this be compared to new MPs getting into parliament through GRC backdoor.
The presidency is largely a ceremonial role. Many are against the idea of presidential election, because an elected president gives the parliament justification to empower the PAP endorsed president with executive powers, if the ruling party so wishes, at a time when it feels that it may lose its grip in parliament. Therefore installing a baboon helps prevent that from happening.
If TJS did not run, voters who are strongly against installing a PAP aligned president will spoil their votes. Voters who were swinging between TCB and TJS would vote for TCB.