Medicare dispute clouds Obama’s Treasury pick: Republican senator

WASHINGTON (Reuters) – Republican Senator Jeff Sessions on Thursday warned that President Barack Obama's nominee for Treasury secretary could face a tough time winning confirmation if the White House did not clear up a dispute over the Medicare health program. Jack Lew, Obama's former chief of staff and budget director, is due to testify on Wednesday before a Senate panel that is vetting him for the administration's top economic job. Lew would succeed Timothy Geithner who left office last month. …