AP source: Adelson giving $10 million to aid GOP

Casino billionaire Sheldon Adelson is making another huge campaign contribution aimed at electing Republicans and voting President Barack Obama out of office.

One of the world's richest men, Adelson is donating $10 million to the campaign activities of the billionaire Koch brothers. A person familiar with Adelson's pledge confirmed the donation Friday, requesting anonymity to discuss the private arrangement.

Adelson has already contributed $10 million to a super political action committee that backs likely Republican presidential candidate Mitt Romney, Restore Our Future, and $5 million to each of two organizations promoting House Republicans.

During the GOP presidential primary, Adelson and members of his family gave $21 million to a super PAC promoting former House Speaker Newt Gingrich.

Oil executives Charles and David Koch founded small-government, anti-tax group Americans for Prosperity.