mitchell reports," republicans and gabby giffords' arizona congressional district are voting on their candidate to fill her seat. the winner will fate ron barber. george zimmerman's attorney has formally requested that the judge residing over his case remove herself. judge recksiedler's husband is partners with an attorney who work as a television analyst and approached about representing zimmerman. the judge will be hearing the motion friday. "discovery's" final journey ended after a spectacular flight that took it over the white house and the mall. people gather around to watch it circle three times over washington and then landed at dulles airport in virginia. coming up next, the battle for pennsylvania. plus, what has president obama done for latino voters to earn