It's all but impossible to keep parties out of an electoral process. We know that. If we go back to the history of the House of Commons, before the early 1960s, if I'm correct, party labels did not appear on ballots. Then we eventually went to the point of having party labels on the ballot because we recognized that partisanship is such an important cue for voters.
On May 14th, 2008. See this statement in context.