Ohio Gov. John Kasich's presidential campaign added an experienced hand as a senior adviser to its operation in New Hampshire. Andy Leach served on Wisconsin Gov. Scott Walker's Granite State team before he exited the presidential race, and worked for Mitt Romney and Sen. Kelly Ayotte's campaigns there in the past.

"With the addition of Andy Leach, the Kasich New Hampshire team — already the strongest in the state — just got stronger," said Beth Hansen, Kasich's campaign manager, in a statement. "For more than twenty years, Andy has been a significant factor in virtually every important Republican campaign in New Hampshire, and we are very happy to welcome him aboard."

Reinforcements to Kasich's campaign in New Hampshire come at a much needed time. The governor consistently polled in the double digits in the state this summer, but now his numbers hover around 8.5 percentage points, according to RealClearPolitics' average of New Hampshire polls. Kasich, who fell to 11th in the Washington Examiner's newest GOP presidential power rankings, has spent much of his time on the campaign trail in the Granite State thus far, and appears to be banking on winning the state.

On a bus trip through the state on Thursday, Kasich told ABC News that the New Hampshire electorate is similar in size to two congressional districts, which reminded him of the campaigns he ran for U.S. Congress from Ohio.

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