PHILADELPHIA — When it was all over — the painstaking background checks, the grilling by lawyers, the 90-minute interview with Hillary Clinton in her northwest Washington home — Sen. Sherrod Brown was surprised by his budding interest in becoming the vice president.adcelannotate = {"mobilepaywallcategory" : "MOBILE_PREM-LOCAL","nativepaywallcategory" : "NATIVE_PREM-LOCAL"};