Progressive Conservative Leader Heather Stefanson, NDP Leader Wab Kinew, and Liberal Leader Dougald Lamont By Steve Lambert THE CANADIAN PRESS WINNIPEG- Manitoba’s three main party leaders squared off over health care, the cost of living and other issues during a one-hour televised leaders debate Thursday night in advance of the Oct. 3 provincial election. NDP Leader Wab Kinew, whose party is leading in opinion polls, was a frequent target of the other two leaders. Progressive Conservative Leader Heather Stefanson, aiming to lead her party to a third consecutive term, accused Kinew of promising $3 billion in new spending, which she said would require a hike in the provincial sales tax. The former NDP government raised the tax in 2013 and was voted out in the next election. Kinew flatly denied…