The Note: Ready For Rand Paul?

— -- NOTABLES

THE MAIN EVENT: Kentucky Sen. Rand Paul is set to announce his candidacy for president of the United States in Louisville today around noon Eastern, ABC's CHRIS GOOD and JORDYN PHELPS note. Paul will be the second major candidate to enter the race for the White House, following in the footsteps of fellow GOP Sen. Ted Cruz. In advance of today's event, Paul's Twitter handle changed overnight from @SenRandPaul to simply @RandPaul.

RAND'S ROAD TRIP -- 5 STATES, 5 THINGS HE HAS TO PROVE: The Kentucky Republican will quickly hit the ground running -- kicking his campaign into high gear with a five-day, multi-state "Stand with Rand" tour across the U.S., with stops in key battleground states -- New Hampshire, South Carolina, Iowa and Nevada -- each meant to highlight a distinct aspect of Paul's message. Here's a look at where he's going and what he has to prove in each place: http://abcn.ws/1JgniXC

RAND PAUL IN A MINUTE: Meet the soon-to-be 2016 presidential contender: Who is he, what he used to do, his family tree, his favorite band, potential baggage and more. http://abcn.ws/1O2PjET VIDEO: http://abcn.ws/1c3AX9K

ANALYSIS -- ABC's RICK KLEIN: Is he his own man, too? (Does he really entirely want to be?) As the nation will begin to learn Tuesday, it's not just Jeb Bush with a textured, layered, and downright complicated family legacy as he seeks the Republican nomination. Sen. Rand Paul will have his father, Ron, on hand in Kentucky when he announces for president -- an important piece of family togetherness and political messaging. But don't look for Ron Paul to speak. Rand's quick political rise was of course helped along by his dad's presidential campaigns and the network of supporters he built along the way. His challenge from here will to not be limited by that -- and not to let it define him. It's hard to overstate the skepticism the GOP establishment harbors told both Pauls -- a sentiment Rand will play up, though to a point. He and his team know that they can't completely alienate the still-robust (and always dedicated) Ron Paul crowd.

THE BUZZ

with ABC's VERONICA STRACQUALURSI

SHOTS FIRED: OBAMA TELLS SCOTT WALKER TO 'BONE UP' ON FOREIGN POLICY. In an interview on NPR's "Morning Edition," President Obama had some tough words for Gov. Scott Walker, suggesting the Wisconsin Republican needs to "bone up" on foreign policy, ABC's ALI DUKAKIS notes. The president's remarks came in response to comments by the governor, a likely 2016 Republican presidential candidate, in recent interviews that if elected, he would withdraw from the Iran deal "on day one" of his presidency -- even if U.S. allies wanted to remain in the arrangement. "I am confident that any president who gets elected will be knowledgeable enough about foreign policy, and knowledgeable enough about the traditions and precedence of presidential power, that they won't start calling into question the capacity of the executive branch of the United States to enter into agreements with other countries," Obama told NPR host Steve Inskeep. "It would be a foolish approach to take, and perhaps Mr. Walker, after he's taken some time to bone up on foreign policy, will feel the same way."