We need to let public sentiment over these abuses of power build and boil over. Do NOT try to impeach Obama! That will shift the focus off of Holder, the IRS, and Benghazi and onto those "mean" House Republicans. Leave him alone. There will never, ever be a trial in the Senate so it's just not worth pursuing.
Win back the Senate in 2014 and the White House in 2016 by letting the president stew in the cesspool he's built. That's a winning strategy. Impeachment is a guaranteed loser.