Harvard's Institute of Politics released the 28th edition of its national poll of young Americans Thursday and the results spell trouble for the Republican Party.

The survey of more than 2,000 young adults, ages 18 to 29, found that the percentage of millennials who prefer to see a Republican win back the presidency is trending downward. While 40 percent of youth voters backed a GOP candidate six months ago, according to previous polling data, that number has now dropped to 36 percent.

Even more worrisome for Republicans is the 13-point jump in the percentage of independent millennials who now prefer to see Democrats maintain control of the White House next November.

Nevertheless, the decline in support for Republicans has yet to translate into an overall boost in support for Democrats. Fifty-six percent of millennial respondents now prefer a Democratic presidential candidate, showing virtually no change since the age group was last surveyed in Spring 2015.

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