sentences:  At the same time the largely Liberal areas of Strathroy and Petrolia tend to balance the more conservative rural regions.The Ontario New Democratic Party (NDP) also has pockets of support in Wallaceburg.During the 1999 election, the riding attracted controversy as it included Ipperwash Provincial Park - the sight of a 1995 stand-off between the Ontario Provincial Police and native land protesters known as the Ipperwash Crisis.