On 7 May 2011 ( polling day ) , the SDP failed to win in Sembawang GRC .
On 7 May 2011 ( polling day ) , the SDP managed to increase its vote share in that constituency by 13 percentage points to 36.1 % .
On 7 May 2011 ( polling day ) , the SDP failed to win in Sembawang GRC but managed to increase its vote share in that constituency by 13 percentage points to 36.1 % .