The great invitation by SDP

I read in the net that SDP had invited Teo Ho Pin to sign a joint letter in protest over the 30% hike in rent for wet market in Bukit Panjang. Teo Ho Pin flatly declined and said it was his constituency and he would know what to do to help his constituents. I will say nice try SDP. The invitation is as good as a still birth the moment it is conceived. How could Teo Ho Pin agree even it is a good