Pennsylvania pubcasters are coming together for a state Public TV Advocacy Day tomorrow in an attempt to save state funding. They’re asking viewers and listeners to write letters to state representatives, senators and Gov. Ed Rendell to restore the governor’s proposed pubcasting budget cuts. His budget would zero out all funding — $7.9 million — for station operations, cut technical support from $4.34 million to $2 million, and abolish the Pennsylvania Public Television Network as an independent commission of state government. Negotiations over the budget could continue for six to eight more weeks, according to published reports. The Advocacy Day Web site also features photos of a May rally by schoolchildren supporting WQLN in Erie, Pa.