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The Invest in Education Act (Proposition 208), has support from nearly half of the voters surveyed, according to The Suffolk University/USA TODAY poll conducted Sept. 28-30. (Photo: Getty Images)

Proposition 208, which would raise taxes for education spending in Arizona, has a solid lead among likely voters, according to a new poll.

The Suffolk University/USA TODAY Network poll found that the Invest in Education Act, which would add a 3.5% tax surcharge on the wealthiest earners in the state, has support from nearly half of the voters surveyed.

Among the likely voters polled, 47% said they supported the measure, 37% opposed and 15% were undecided. The support largely falls along party lines, with more Democrats supporting the measure than Republicans. Independents were evenly split.

The live-interview poll of 500 likely voters in Arizona was conducted between Saturday and Wednesday and has a margin of error of 4.4 percentage points.