A Bloomberg News poll released Thursday shows trouble for the potential presidential candidacy of former Alaska Gov. Sarah Palin. A vast majority of respondents viewed Palin unfavorably. Sixty percent had an unfavorable view of Palin, compared with only 28 percent with a favorable one. President Obama had a personal favorability rating of 55 percent with 41 percent viewing him unfavorably. Two other potential Republican candidates for the presidency, businessman Donald Trump and former Speaker of the House Newt Gingrich, had low favorability ratings. Trump was viewed favorably by 37 percent of respondents and unfavorably by 43 percent. Gingrich was viewed...