King will also appear on the campaign trail for Akin in Kansas City, Mo., and Jefferson City, Mo., over the weekend.

Both Bachmann and King are major Tea Party figures and prominent social conservatives.

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Akin is competing in a three-way primary for the GOP nomination to take on Sen. Claire McCaskillClaire McCaskillA Cabinet position for Petraeus; disciplinary actions for Broadwell after affair Defense bill tackles retaliation against military sex assault victims Red-state Dems face tough votes on Trump picks MORE (D-Mo.).