In 2007, the riding was redistributed, and it lost Plympton-Wyoming, Enniskillen, Petrolia, Oil Springs while it gained the rest of North Middlesex, Lucan Biddulph and Middlesex Centre.
Considered a bellwether or swing riding, the area tends to attract frequent visits by party leaders during elections. The political instability of the riding is largely attributed to the diversity of political and religious opinion within its borders. A rural riding by nature, the issues of gun control and abortion arise frequently during town-hall meetings and elections. 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 the 1995 stand-off between the Ontario Provincial Police and native land protesters. Political events in the riding became frequent targets for further protests by natives unhappy with the Conservative Government's handling of the Ipperwash Affair and the associated shooting death of protester Dudley George. Despite the controversy, Progressive Conservative MPP Marcel Beaubien was re-elected to the Legislative Assembly of Ontario, despite a strong campaign by Liberal and municipal politician Larry O'Neil and an aggressive campaign by New Democrat Jim Lee, then-President of UAW Local 251 .