U.S. President Barack Obama (C) greets fellow diners after he and Vice President Joe Biden (not pictured) bought lunch at a sandwich shop near the White House in Washington, October 4, 2013. House Republicans held their ground on Friday in a standoff with Obama over the U.S. government shutdown, accusing him of intransigence and not caring about the impact of the shutdown, now in its fourth day. REUTERS/Jonathan Ernst (UNITED STATES - Tags: POLITICS BUSINESS)