DOWN TO THE WIRE: Facebook exec, President Obama make last-weekend push for Martha Coakley

Our intrepid political reporter DAVID BERNSTEIN is micro-blogging the Brown-Coakley campaign as we head into the final 72 hours. Follow Bernstein on Twitter to get the latest. Among his updates recently:

• Watch out, FB-loving Brown supporters: Facebook's Chief Privacy Officer recently contributed $2400 to Coakley.
• BARACK OBAMA announces a last-second visit to stump for Coakley on Sunday. Evidence of confidence or desperation on the part of Democrats?
• New ARG poll shows BROWN ahead among registered voters who say they'll definitely vote

Stay tuned...