The Texas congressman spent the most time in Minnesota of any competitors ahead of Tuesday's voting and planned to see it through with a caucus-night party outside Minneapolis.
It reflects Paul's strategy of concentrating on caucus states where he can amass national convention delegates even if he doesn't win.
In his Minnesota stops, Paul has hit on anti-war themes and cast himself as the candidate most committed to cutting government budgets.
Four years ago, Paul won nearly 16 percent of the caucus vote to finish fourth in Minnesota, where Massachusetts Gov. Mitt Romney won.
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