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In page Ed Clark:

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Another factor leading to the unprecedented (for California) 5.46% vote total for Clark was his libertarian campaign occurring the same year as the successful Proposition 13 which limited property taxes, and the unsuccessful anti-gay Briggs Initiative (Proposition 6). Clark and the California Libertarian Party campaigned in support for Proposition 13[2] and in opposition to Proposition 6[3] both of which turned out people to the polls who might be more inclined to favor a libertarian candidate.