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Newly sworn-in Sen. Scott Brown (R-Mass.) will stump for the man he calls his "mentor," Sen. John McCain (R-Ariz.), in March.

Brown's surprise victory last month in the Massachusetts special election to replace the late Sen. Edward Kennedy (D-Mass.) has made him a hot commodity amongst Republicans.

The Arizona Republic on Friday first reported Brown's appearance.

McCain faces a primary challenge this year from former Rep. J.D. Hayworth, who is trying to outflank the veteran senator on the right.

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