Gov. Ed Rendell renewed his pledge to deliver a property tax relief bill yesterday as scores of soggy supporters cheered the Pittsburgh stop on the victory lap of the state he has been running since claiming the Democratic nomination for a second term.

"We're going to get property tax relief,'' Mr. Rendell said, as his partisans braved a steady rain outside his campaign headquarters on Ross Street, Downtown. "If they don't pass it in June, I'll call a special session [of the Legislature] for July. If they don't pass it in July, I'll call a special session in August.''

Earlier in the day, his November opponent, Republican Lynn Swann, stood just two blocks away, promising to offer his own detailed proposal to change the state's property tax system at an appearance in Harrisburg Monday.

After Mr. Swann's morning news conference in Pittsburgh yesterday, an aide said the plan would call for some form of immediate relief for homeowners coupled with a more sweeping, longer-range revision of the assessment system that would require a state constitutional amendment.

Mr. Swann has repeatedly criticized his opponent over the fact that the state has yet to enact the property tax relief that Mr. Rendell called for in his 2002 campaign.

Mr. Rendell was frustrated that the state House refused to vote on a property tax measure supported by his administration and approved by the Senate. House Republican leaders said they balked at the measure, whose benefits were most generous for less affluent seniors, because they preferred a broader approach extending more benefits to more taxpayers.

In his appearance, Mr. Swann repeated familiar criticisms of the incumbent, complaining about the lack of progress on the tax issue and criticizing him for vetoing a measure that would have restricted lawsuits alleging medical malpractice.

Mr. Swann contended that he was the only candidate who could bring true reform to Harrisburg.

Mr. Rendell swept in for his afternoon appearance in the colorful campaign bus that has been taking him across the state this week as he kicks off his general election bid. It was, by the governor's count, the 147th visit he has made to Allegheny County since taking office. During that time, the former Philadelphia mayor said, he had belied characterizations of him as Philadelphia's governor by distributing more than $1 billion in state aid for more than 600 projects throughout the county.