A ballot measure to legalize use and retail sales of marijuana continues to hold the support of half of Colorado voters in a new Denver Post poll, setting up a campaign finish that may go down to the last vote.

Amendment 64 — which would make legal possession of up to an ounce of marijuana for people over age 21 and allow for marijuana to be sold in special stores — is supported by 50 percent of likely voters surveyed for the poll. It is opposed by 44 percent. The amendment's 6-point lead is outside the poll's 3.8 percent margin of error.

In two previous Denver Post polls, Amendment 64's support has fluctuated

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