Illegal phone calls for Obama?

Is this legal?

I just received this from the RPW-

“Already we’ve seen a public school used to send automated phone calls on Obama’s behalf. He raked in millions of dollars in the past two weeks but uses a taxpayer-funded school – one already suffering from a million dollar shortfall – to make campaign calls,” Jefferson said.

Jefferson’s comments were in response to a Green Bay television investigation into reports that the Kaukauna Area School District sent automated phone messages regarding a campaign event scheduled at the school. Yet, similar calls apparently have not been made to announce such things as school closings in the past. The story aired on WGBA-TV.

Is it legal to use our tax dollars to promote a political event.

Anybody else heard anything about this?