Use χ² Test. Let α = 0.05. The hypotheses are: H₀: p₁ = p₂ = p₃ and H_a: the proportions are all not equal. The P–value = 1.5319637E–9 which is essentially 0. Since P–value ≤ α, we reject H₀. This means there is a relationship between a voter's political affiliation and their preference for the candidates.