Political Grapevine: Supreme Court Gaining Ground in Public Approval Rating, New Poll Says

You've heard about the GOP candidates and President Barack Obama taking their turns moving up and down in the polls ... but this time, it's the Supreme Court making a move. Their approval rating by likely voters has gone up 13 percentage points since mid-March, according to a Rasmussen poll just out.

Plus - the viral tweet of the day came from none other than Sen. Charles Grassley (R-IA). Find out what sparked a back-and-forth between him and Obama adviser David Axelrod.

That and more are all a part of tonight's Political Grapevine.