The Chicago Teachers Union strike enters its third day today with negotiations between Chicago Public Schools and the union to resume at 11:00 a.m. Here are a few key developments from the last 24 hours:

* CPS announced that starting Thursday schools that are part of the strike contingency plan would be open until 2:30 p.m. instead of 12:30 p.m. These now 147 schools (it was initially 144) will continue to open at 8:30 a.m. The Chicago Tribune reports that attendance at contingency plan sites has been low.

* As PI reported, SEIU Local 1 janitors at contingency plan school sites might not work beginning Friday in solidarity with CTU. While a number of local unions showed their support yesterday for CTU, the janitor action is the only potential work stoppage planned.

* A day after Republican presidential nominee Mitt Romney condemned the strike, his running mate, U.S. Rep. Paul Ryan, chimed in. "Rahm and I have not agreed on every issue or on a lot of issues, but Mayor Emanuel is right today in saying that this teacher's strike is unnecessary and wrong," the Wisconsin Republican said at a campaign stop in Portland, Oregon. President Barack Obama has not publicly taken sides on the strike. Nor has Education Secretary Arne Duncan, the former head of CPS.