Republicans on a private Republican National Committee conference call with allies warned Tuesday that party surrogates should refrain from personal attacks against President Barack Obama, because such a strategy is too hazardous for the GOP. "We're hesitant to jump on board with heavy attacks" personally against President Obama, Nicholas Thompson, the vice president of Tarrance Group, a Republican polling firm, said on the call. "There's a lot of people who feel sorry for him." Recent polling data indicates that while the president still suffers significantly low job approval ratings, voters still give "high approval" to Obama personally, Thompson said. Voters...