Hillary Clinton Announces 2016 Presidential Bid  —  Ending two years of speculation and coy denials, Hillary Rodham Clinton announced on Sunday that she would seek the presidency for a second time, immediately establishing herself as the likely 2016 Democratic nominee.

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.

For 2016, a tidal wave of cash  —  The most stunning political news of the year to date is last week's revelation that a group of super-PACs has already raised $31 million to support the presidential bid of Sen. Ted Cruz (R-Texas).  —  And last week also brought the most intriguing political news …

Why Marco Rubio couldn't say no  —  “For Marco, being told he can't do something is a challenge.”  —  Some of Marco Rubio's early backers called themselves the Three Percent Club, because that's where the ambitious young Republican was polling when he began running for U.S. Senate six years ago.

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 …

Will We Let Iran, Like Russia, Violate Its Nuclear Pact?  —  How Moscow's long-time gaming of the 1987 INF treaty illustrates dangerous lessons.  —  In a major speech on Thursday, Iran's supreme leader, Ayatollah Ali Khamenei, issued what amounted to a warning of things to come.