An overwhelming majority of voters favor legalizing recreational marijuana in North Dakota, according to an Inforum poll conducted this week. The online poll showed 514 of 624 poll-takers, or 82.4 per cent, support legalization in the state, where voters will cast ballots on the measure Nov. 6. Dave Owen, chairman of the North Dakota Marijuana Legalization Initiative, said the poll could be representative of what North Dakotans want in November. "It shows the people of North Dakota see that and actually want this."

Identify any problems in the above. How could this studies be better conducted and what type of sampling method was utilized here?