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WHAT YOU MIGHT HAVE MISSED: 

* A pair of Democratic senators with "A" ratings from the National Rifle Association said Monday they would be open to greater regulation of assault rifles. Sens. Mark Warner (Va.) and Joe Manchin (W.Va.) said Friday's mass shooting in Connecticut changed their perspectives. "Never before have we seen our babies slaughtered,” Manchin said. “Anybody that’s a proud gun owner, anybody that’s a proud member of the NRA, we’re also proud parents. We’re also proud grandparents.”

* The White House offered few details on Monday about President Obama's plans to curb gun violence. "I don’t have a specific agenda to announce to you today. I would simply point you to what the president said last night about moving forward in coming weeks. And I would look for him to do that," White House Press Secretary Jay Carney told reporters. Meanwhile, a petition on the White House Web site calling for action to limit access to firearms has garnered more than 145,000 signatures, making it the most popular online petition under the White House's “We the People” program. 

* Sen. Marco Rubio (R-Fla.) is “open to measures that would keep guns out of the hands of criminals and the mentally ill,” his spokesman said. Spokesman Alex Conant added that Rubio "remains a strong supporter of the Second Amendment right to safely and responsibly bear arms." 

* Since Friday's mass shooting in Connecticut, the NRA has stopped tweeting on all of its accounts and suspended its Facebook page. 

WHAT YOU SHOULDN'T MISS: 

* In the wake of the Connecticut school shooting, Michigan Gov. Rick Snyder (R) is thinking about vetoing a measure that could allow concealed weapons in schools. Snyder also said a personal experience also has factored into his thinking. During the 1981 Good Friday shooting at a dorm at the University of Michigan, Snyder was a resident adviser, and pulled the fire alarm, he said, while two others went to deal with the gunman. 

* One person who won't be serving as an interim senator if Sen. John Kerry (D-Mass.) leaves his seat to become the next secretary of state: Former Bay State governor and 1988 presidential nominee Michael Dukakis (D). “That’s a no," Dukakis said in an interview

* At the end of his 24-year Senate tenure, retiring Sen. Joe Lieberman (I-Conn.) now backs term limits. He also wants to get rid of the Electoral College. 

* Longtime film director Martin Scorsese will produce/direct an HBO documentary about Bill Clinton. 

THE FIX MIX: 

Time to ponder a career in gymnastics?

With Aaron Blake