Story highlights Trump leads Clinton by 4 points in Indiana, according to a Monmouth University survey

Clinton was 11 points behind in August

Washington (CNN) A new poll finds Donald Trump now facing a tight race in running mate Mike Pence's home state of Indiana, adding to a growing list of red states now in play this election cycle.

According to a Monmouth University poll released Friday, the Republican presidential nominee has a slim lead of four percentage points -- within the margin of error -- on Democratic opponent Hillary Clinton. In August, Clinton was trailing Trump by 11 points there, Monmouth found

This latest poll suggests a shift in Indiana's political landscape, with Pence's approval rating slipping and Democrats looking more likely to win the state's Senate and gubernatorial contests.

Among the likely Indiana voters surveyed, 45% said they would cast a ballot for Trump and 41% for Clinton. Another 9% support Libertarian presidential nominee Gary Johnson, while 5% remain undecided. Trump led Clinton 47% to 36% two months ago.

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