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Democratic presidential candidate Sen. Hillary Clinton (D-NY) speaks about her plan to reward companies that create jobs in America, at the 21st Century Jobs Summit at the IBEW in Pittsburgh, Pennsylvania on April 2, 2008. (UPI Photo/Stephen Gross)

MISSOULA, Mo., April 7 (UPI) -- Sen. Hillary Clinton signaled she is in the campaign for the long-haul at an event in Montana, which holds one of the last presidential primary elections.

The New York Democrat said the battle between her and rival Sen. Barack Obama, D-Ill., is so close, "we don't know how it is going to turn out," CNN reported Monday. Montana holds its Democratic primary June 3.

Clinton gave no hints her campaign would come to an end following a series of setbacks, including the resignation of top a strategist, Mark Penn, over a free trade issue with the Clinton camp and his lobbying firm, Burston Marsteller.

"This campaign has been exciting and incredibly energizing … and I believe with all my heart that it is good for the Democratic Party to give the people of Montana a chance to vote in June, to have your vote counted and your voices heard," Clinton said.