Morris Polling Conducted a Poll 6 Months Before an Election

Short Answer

Morris Polling conducted a poll 6 months before an election in a state in which a Democrat and a Republican were running for governor and found that 70% of the voters intended to vote for the Republican and 30% intended to vote for the Democrat. In a poll conducted 3 months later, it was found that 60% of those who had earlier stated a preference for the Republican candidate still maintained that preference, whereas 40% of these voters now preferred the Democratic candidate. Of those who had earlier stated a preference for the Democrat, 70% still maintained that preference, whereas 30% now preferred the Republican candidate.
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If the election were held at this time, who would win?
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Assuming that this trend continues, which candidate is expected to win the election?