(CNN) - The newest member of the Senate will soon hit the 2010 campaign trail for Arizona Sen. John McCain. A McCain source confirms Sen. Scott Brown, R-Massachusetts, will campaign with the 2008 Republican presidential nominee in early March. McCain is facing a primary challenge from former Rep. J.D. Hayworth. (snip) Former Republican vice presidential nominee Sarah Palin will also hit the campaign trail for McCain at the end of March.