As Sarah Palin ponders a 2012 presidential campaign, some prominent Republicans are urging her to resist the temptation to run even as her devoted followers flock to her book tour. In recent days, a debate has broken out among Republicans over whether the 2008 Republican vice presidential nominee and popular activist would be able to defeat a politically weakened President Barack Obama in two years. The criticism, rejected by Team Palin, reflects concerns among establishment Republicans that the former Alaska governor lacks the gravitas to oust a sitting president, even a struggling one. Palin has a very strong following in...