Open primaries obscure the distinctions between political parties  Primaries tend to favour candidates that are more centrist in nature, as non-committed voters are more likely to vote for such a candidate than grass roots members of the party hosting the primary, who are much more likely to prefer a candidate who is more ideological.  The dominance of centrist candidates in primaries may lead to convergence between the major parties to the extent that there is little difference between them for voters to choose from in the general election. [1] This creates the harm of not presenting a clear democratic choice to voters, which can help feed the discontent with politics that discontent hopes will be countered by Open Primaries.  [1] White, Stuart, ‘Why open primaries are a really bad idea’, NextLeft, 26 May 2009,