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J. Scott Applewhite, Associated Press
In this photo taken Feb. 10, 2015, Sen. Rand Paul, R-Ky. takes questions during an interview with The Associated Press in his office on Capitol Hill in Washington.

WASHINGTON — Sen. Rand Paul hasn't yet declared his candidacy for president, but the Kentucky Republican already is finding the campaign trail to be a more uncomfortable place than the cloistered, tradition-bound Senate.

He's frustrated by what draws headlines instead of his work in the Senate, which has earned praise from once-wary colleagues in both parties.

Paul, speaking of his prospective White House run, says "part of the decision-making process is, 'Do you have a chance? Is the message resonating? Do people believe that you can somehow win this?' "

"Because it's not really a lot of fun," he says.