ASHEVILLE, North Carolina (Reuters) - Democrat Barack Obama counterattacked on Sunday against a new Republican tactic by saying rival John McCain was more interested in a smear campaign than fixing the U.S. economy. The Obama campaign unveiled an ad hitting McCain as one of the "Keating Five" senators who met federal regulators on behalf of a California savings and loan institution that collapsed in 1989. The ad faults McCain as unwilling to regulate the financial industry. With McCain losing ground in opinion polls, a campaign strategist was quoted as saying the Republican presidential candidate needed to "turn the page" on...