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Sen. Rand Paul walks into the Associated Builders and Contractors of Indiana/ Kentucky office in Bowling Green, Ky., on Monday, March 23, 2015, where he gave a speech and answered questions.(Photo: AP)

WASHINGTON When Sen. Rand Paul spoke in February to a conservative gathering just outside the nation's capital, the Kentucky Republican promised to propose a tax cut.

But not just any tax cut "the largest tax cut in American history," Paul told the Conservative Political Action Conference.

The details of his plan would be revealed "in the coming weeks," he said.

Now, as he prepares to announce a White House bid, Paul's vision of what amounts to a massive taxpayer refund from a government he wants to make smaller is certain to be a centerpiece of his campaign.

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Paul who is expected to announce his bid Tuesday at Louisville's Galt House cut his political teeth on the theme of reducing the size of government and slashing spending. His tea party-backed candidacy for the Senate in 2010 was successful largely because he adhered to that message.

But based on his talking points during his travels around the country over the past couple of years, taxes, spending and the role of government are just some of the issues likely to form the core of his bid.

The senator's overall message, as he articulated in his response to President Barack Obama's State of the Union address in January, is that "all is not well in America. America is adrift."

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Rand Paul views, from tax cuts to Iran talks