(CNN)Hillary Clinton declared victory early Tuesday morning in a razor-thin contest against Bernie Sanders in Iowa. But Democratic party officials have not yet declared a winner.

“Hillary Clinton has won the Iowa Caucus,” the Clinton campaign said. “After thorough reporting — and analysis — of results, there is no uncertainty and Secretary Clinton has clearly won the most national and state delegates.”

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The state party indicated in a separate statement that it was not ready to make a call.

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“The results tonight are the closest in Iowa Democratic caucus history,” Iowa party chairman Andy McGuire said. “We will report that final precinct when we have confirmed those results with the chair.”

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One thing is clear after Monday night’s Iowa caucuses: there’s a long, volatile election season ahead before two deeply fractured parties can unite behind a nominee.