More than half of the country has a message for former Republican vice-presidential nominee Sarah Palin: enough. That's the result from a new NBC News/Wall Street Journal/Annenberg poll in which 54 percent of voters say they've heard enough from Palin and would prefer that she be less outspoken in political debates. That includes nearly two-thirds of Democrats, a majority of independents, and even nearly four-in-10 Republicans. And the results come as Palin has called for President Barack Obama's impeachment. (VIDEO-AT-LINK)But Palin isn't the only former politician voters wish would stay away from politics. Fifty-one percent of voters say they've heard...