First on CNN: Hillary Clinton takes road trip to Iowa  —  (CNN)Iowa or bust.  —  Hillary Clinton is kicking off her second bid for the White House with a road trip, riding from New York to her first campaign stop on Tuesday in Iowa.  She was spotted on Sunday evening chatting with people at a gas station in Pennsylvania.

Marco Rubio set to launch 2016 bid  —  WASHINGTON — Sen. Marco Rubio of Florida, a telegenic rising star with appeal to conservative and establishment Republicans, is poised to jump into the presidential race today.  —  Rubio has scheduled a “big announcement” this evening at Miami's Freedom Tower.

Walter Scott shooting: officer describes adrenaline rush in recording  —  Michael Slager appears to laugh nervously in audio recording as he discusses what will happen next with a senior officer  —  The police officer who killed Walter Scott in South Carolina said afterwards that he was experiencing …

In U.S., Uninsured Rate Dips to 11.9% in First Quarter  —  Story Highlights  —  WASHINGTON, D.C. — The uninsured rate among U.S. adults declined to 11.9% for the first quarter of 2015 — down one percentage point from the previous quarter and 5.2 points since the end of 2013, just before the Affordable Care Act went into effect.

Wealthy donors on left launch new plan to wrest back control in the states  —  SAN FRANCISCO — A cadre of wealthy liberal donors aims to pour tens of millions of dollars into rebuilding the left's political might in the states, racing to catch up with a decades-old conservative effort that has reshaped statehouses across the country.

U.S. Widens Role in Saudi-led Campaign Against Houthi Rebels in Yemen  —  Washington has concerns about Riyadh's goals in the conflict  —  The U.S. is expanding its role in Saudi Arabia's campaign in Yemen, vetting military targets and searching vessels for Yemen-bound Iranian arms amid growing concerns …

Driver, teen shot to death after van hits and kills toddler  —  The van that struck and killed a toddler in the 4600 block of N. 48th St. and the area surrounding it are cordoned off by police tape.  The driver, who stayed at the scene, was fatally shot.  And a 15-year-old at the scene also was fatally shot.

It Takes a Party  —  So Hillary Clinton is officially running, to nobody's surprise.  And you know what's coming: endless attempts to psychoanalyze the candidate, endless attempts to read significance into what she says or doesn't say about President Obama, endless thumb-sucking about her “positioning” on this or that issue.

Pentagon Deploys ‘May I Kiss You?’  Training  —  An issue that could “dramatically affect” the mission of the United States Armed Forces is telling soldiers when it is okay to kiss a girl.  —  The Air Force is the latest branch to employ the services of Mike Domitrz, a speaker and author known for his …