Kerry raps Rubio for blocking US ambassador to Mexico pick

WASHINGTON (AP) — Secretary of State John Kerry veered into presidential politics by rapping Senator Marco Rubio for blocking the president's nomination for U.S. ambassador to Mexico.Kerry says Rubio is punishing the United States by keeping nominee Roberta Jacobson from being confirmed.Rubio, a Florida Republican and GOP presidential candidate, objected to Jacobson because of her role in negotiating the normalization of U.S. relations with Cuba. Jacobson is a career civil servant.Kerry, w