"Al Sharpton is leaving MSNBC's weekday dayside lineup, and moving to Sunday mornings," Politico's Alex Weprin reported shortly after 7:30 Eastern this evening at CapitalNewYork.com. The activist-cum-TV host's last Politics Nation program is slated for September 4. After a month's hiatus -- side note: wouldn't it be hilarious to see Al try to read that word off his Teleprompter? -- he'll start his Sunday morning show on October 4: "I want to congratulate Al and his team. For four years they have done a terrific job bringing his voice and a big spotlight to issues of justice, civil rights and...