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Rand Paul
Where are Hillary Clinton's Democratic rivals?
Where are Hillary Clinton's Democratic rivals?

As the campaign to succeed President Obama shifts into high gear, Republican voters seem assured of a contested race for their party's nomination that will feature generational, geographical, occupational and ideological contrasts. On Monday, Sen. Marco Rubio of Florida announced his candidacy for the 2016 nomination, joining declared or almost-declared candidates Jeb Bush, the former Florida governor; Wisconsin Gov. Scott Walker; and Sens. Rand Paul of Kentucky and Ted Cruz of Texas. All these candidates profess to be conservatives, but differences abound on issues from immigration to school reform to the U.S. role in the world. (Paul, though he denies being an isolationist and...