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Alliances often highlight strategic differences between participating in parties and advancing the values of the Green movement.

For example, Greens became allied with centre-right parties to oust the centre-left ruling PRI party of Mexico.

Ralph Nader, the 2000 presidential nominee of the US Greens, campaigned with ultra-conservative Pat Buchanan on joint issues such as farm policy and bans on corporate funding of election campaigns, although this " alliance " between Nader and Buchanan was very specifically limited to the purpose of showing that there was broad support for certain specific issues, across the political spectrum.