Republicans won't need to put a candidate like Sarah Palin on the presidential ticket this year, veteran party strategist Charlie Black says, because the candidates are already conservative enough. Asked at National Journal's Election Preview on Tuesday whether he thought the party might name a vice presidential candidate like Sarah Palin, whose addition to the GOP 2008 presidential ticket excited conservatives -- but also turned off independent voters -- Black argued such a pick won't be necessary given the current crop of presidential candidates. "We don't have any moderates running," Black said. "I don't think there will be any need...