John McCain and Sarah Palin will be back on the campaign trail together.
Friday will be their first time campaigning together since McCain lost the presidential election a year and a half ago with Palin as his running mate.
This time, they have a different prize in sight: McCain's Senate seat.
The Arizona senator is in the midst of the toughest re-election battle of his Senate career. Former congressman and conservative talk-radio host J.D. Hayworth is mounting a challenge in the Republican primary.
Palin will help McCain trump his conservative credentials at rallies in Tucson on Friday and the Phoenix suburb of Mesa on Saturday. The former running mates also will hold a fundraiser in Phoenix on Friday.
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