Labour leader Ed Miliband said the industrial action taken by public sector workers today was "a sign of failure on signs".
He said: "We don't support the strikes because they are a sign of failure on all sides.
"I think the Government bares a share of responsibility for another reason too; they promised low paid workers a £250 pay rise and it didn't happen, they've demonised teachers and I'm not going to demonise public sector workers."
Union leaders said they were "overwhelmed" by support after a strike by public sector workers caused widespread disruption.
David Cameron, Michael Gove and other Government figures depicted in a variety of unflattering manners by striking public sector workers.
Hundreds of schools are to close tomorrow as teachers join strike action. Find out what schools in your area are affected.