She called Barack Obama "my favorite guy" and "my choice" before he even announced he would run for President. Now Oprah will put her endorsement into action by hosting a star-studded fund raiser for the Democratic Senator in September at her sprawling estate near Santa Barbara, Calif. Tickets for the event, touted on invites as "the most exciting Barack Obama event of the year anywhere," cost $2,300—the maximum contribution during the primary season.