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    U.S. Senator endorses Rubio live on The Lead

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U.S. Senator endorses Rubio live on The Lead

Sen. Pat Toomey, (R) Pennsylvania, announces he's backing Sen. Marco Rubio in the Republican presidential race.

U.S. Senator endorses Rubio live on The Lead

Sen. Pat Toomey, (R) Pennsylvania, announces he's backing Sen. Marco Rubio in the Republican presidential race.