• Current TV correspondent David Shuster calls in at 9:30am ET / 6:30am PT to talk about the latest in the 2012 Presidential Campaign

• Charlie Pierce of Esquire’s Politics Blog calls in at 10:30am ET / 7:30am PT to talk about the real start of the 2012 Presidential Campaign

• Rep. Karen Bass (D-CA) calls in at 11:30am ET / 8:30am PT to talk about the GOP’s plan to boost the military and cut social programs

• The CIA thwarted a plot by al Qaeda’s affiliate in Yemen to destroy a U.S.-bound airliner using a bomb with a new design. Officials, however, deny there was ever any immediate threat to the public.

• Rick Santorum endorsed presumptive GOP nominee Mitt Romney late Monday night in an email to supporters, saying a private meeting with the former governor last week had given him confidence that issues important to him would be well represented in the general election.

• Speaking at a plant that stamps parts for truck manufacturers, Romney continued his attack on President Obama ‘s economic stewardship, including the April unemployment rate of 8.1 percent–a figure the presumptive GOP nominee has said is double what it should be.

• President Obama’s re-election team unveiled a new ad Monday, striking back at the presumptive challenger Mitt Romney’s assertion that Mr. Obama’s three-plus years in power have been a failure.