why the demonstration was postponed

From the text:

Then it occurred to us that the March election [for Birmingham’s mayor] was ahead, and so we speedily decided to postpone action until after election day. When we discovered that Mr. Connor [the commissioner of public safety, Eugene “Bull” Connor] was in the runoff, we decided again to postpone action so that the demonstration could not be used to cloud the issues. Like many others, we waited to see Mr. Connor defeated, and to this end we endured postponement after postponement. Having aided in this community need, we felt that our direct-action program could be delayed no longer.