Former Alaska Gov. Sarah Palin is the best known and most positively rated of five possible contenders for the 2012 Republican presidential nomination. Her 76% favorable rating among Republicans is higher than those for Mike Huckabee, Newt Gingrich, Mitt Romney, and Bobby Jindal. Huckabee and Gingrich have similar 64% to 65% favorable ratings among Republicans, Romney has a lower 54% rating, and Jindal, less well known even to Republicans, has the lowest positive rating of the five. None of these politicians has officially announced a bid for the 2012 Republican nomination, although Gingrich has recently indicated that he is thinking...