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“This was an unintentional oversight and I regret any inconvenience this may cause,” Akin wrote in a letter to the House Ethics committee, which was obtained by the Post-Dispatch.

Akin is receiving pension payments from his time as a Missouri state legislator. Sen. Claire McCaskillClaire McCaskillFive things to watch for in Mnuchin hearing Senators introduce dueling miners bills GOP must avoid Dems' mistakes when replacing ObamaCare MORE (D-Mo.), who Akin is running to unseat, also receives a state pension from her time in Missouri state government.

Akin last year had to amend disclosure forms to reflect hundreds of thousands in property assets from 2010 that he had also failed to disclose.