HARRISBURG – Democrat candidates for Pennsylvania governor are preparing for their first debate since the release of polls showing Tom Wolf as front-runner. Six of the seven declared candidates are slated to participate in a two-hour debate tonight at the Pennsylvania Progressive Summit in Harrisburg. Former state Auditor General Jack Wagner declined to participate, citing other commitments. Two independent polls released Wednesday, following a month long TV advertising blitz by Wolf, suggested the nomination might be his to lose. Quinnipiac University’s poll showed the York businessman beating GOP Gov. Tom Corbett 52% to 33% in a general election race – a much larger gap than similar matchups with the other Democrats. A Franklin & Marshall College survey said Wolf holds a strong lead over the other Democrats.