Rand Paul announces his campaign for president

Sen. Rand Paul, R-Ky., listens to supporters chant “President Paul” while announcing his candidacy on April 7 in Louisville, Ky.  (Luke Sharrett / Getty Images)

Sen. Rand Paul, R-Ky., is joined by his wife, Kelley Ashby, as he arrives to announce the start of his presidential campaign on April 7 in Louisville, Ky.  (Carolyn Kaster / Associated Press)

Sen. Rand Paul, R-Ky. greets wife Kelley Ashby on stage on April 7.  (Carolyn Kaster / Associated Press)

Rep. Ron Paul, R-Texas, sits on stage before watching his son Sen. Rand Paul, R-Ky., announce his candidacy for president on April 7.

Campaign buttons for sale outside the event at which Sen. Rand Paul, R-Ky., announced his presidential candidacy on April 7 in Louisville, Ky.  (Luke Sharrett / Getty Images)

Sen. Rand Paul of Kentucky arrives to address the American Conservative Union’s 42nd Annual Conservative Political Action Conference (CPAC) at National Harbor, Md., on Feb. 27, 2015.

Sen. Rand Paul speaks in Manchester, N.H., on March 20, 2015.

Sen. Rand Paul exits Beantowne Coffee House & Cafe on March 21, 2015, in Hampstead, N.H.

Sen. Rand Paul listens to a question after speaking at Beantowne Coffee House & Cafe on March 21, 2015, in Hampstead, N.H.

Sen. Rand Paul takes questions during a meet and greet at the Epoch Restaurant in Exeter, N.H.