Rand vs. Rubio: The 2016 Republican primary begins tonight

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It’s Sen. Marco Rubio (R-Fla.) vs. Sen. Rand Paul (R-Ky.).

The two most likely 2016 presidential candidates in the Senate will go back-to-back tonight in consecutive rebuttals to President Obama’s State of the Union address. First will be Rubio offering the official Republican response; then will come Paul delivering the tea party’s take.