SMU Assistant Professor of Law and NMP Eugene Tan said Dr Poh's incident might sway undecided voters. "One of the hallmarks of the Workers' Party has always been that strong party discipline, strong party cohesion. The mixed signals that were coming somewhat dramatically yesterday and which continue till today with Dr Poh Lee Guan unilaterally declaring himself as a backup insurance plan, I think all that would raise questions about party unity," said Professor Tan.