Sen. Kennedy has malignant brain tumor  —  BOSTON - Sen. Edward M. Kennedy has a malignant brain tumor.  —  Doctors for the Massachusetts Democrat say tests conducted after Kennedy suffered a seizure this weekend show a tumor in his left parietal lobe.  Preliminary results from a biopsy …

McCain Confronted With New Iran Gaffe, Gets Facts Wrong Again (VIDEO)  —  Yesterday, Time's Joe Klein noted that he could find no evidence that Sen. Barack Obama had ever specifically said he would negotiate with Mahmoud Ahmadinejad: … Later in the day, Klein confronted McCain with this question at a press conference.

McKinnon To Step Aside From McCain Effort  —  Mark McKinnon, the lead media consultant for Sen. John McCain's (Ariz.) presidential bid, is stepping down from that role — making good on a pledge he made last year not to work against Sen. Barack Obama (Ill.) in the fall campaign.

Talking Versus Doing  —  In 1965, Mancur Olson wrote a classic book called “The Logic of Collective Action,” which pointed out that large, amorphous groups are often less powerful politically than small, organized ones.  He followed it up with “The Rise and Decline of Nations.”

Key Clinton Constituencies Moving Toward Obama  —  Obama now competitive among women, whites, and the less educated  —  PRINCETON, NJ — Gallup Poll Daily tracking has documented a surge in Democratic voters' support for Barack Obama over Hillary Clinton in recent days …

‘Bush intends to attack Iran before the end of his term’  —  US President George W. Bush intends to attack Iran in the upcoming months, before the end of his term, Army Radio quoted a senior official in Jerusalem as saying Tuesday.  —  The official claimed that a senior member of the president's entourage …

Clinton Puts Up A New Fight  —  The Candidate Confronts Sexism On the Trail and Vows to Battle On  —  Women of all ages and nationalities push against the rope line carrying books and T-shirts, posters and stuffed animals — anything for her to autograph.  They tote huge signs that shout …

Teenager faces prosecution for calling Scientology ‘cult’  —  A teenager is facing prosecution for using the word “cult” to describe the Church of Scientology.  —  The unnamed 15-year-old was served the summons by City of London police when he took part in a peaceful demonstration opposite …

As Primaries End, Clinton Appeals Directly to Blogs  —  As Hillary Rodham Clinton decries the mainstream media for diminishing her chances of capturing the Democratic nomination, she is turning more to the Internet to make her increasingly urgent case.  —  She held her first blogger …

Govt. May Have Massive Surveillance Program For Use In ‘National Emergency,’ 8 Million ‘Potential Suspects’  —  Last year, former deputy attorney general James Comey revealed that in 2004, he refused to “certify” the legality of certain aspects of the National Security Agency (NSA) spy program.

YouTube refuses Lieberman request  —  The chairman of the Senate Homeland Security and Governmental Affairs Committee today asked Google, the parent company of the popular online video-sharing site, YouTube, to “immediately remove content produced by Islamist terrorist organizations” …

Interview with Barack Obama  —  See transcript below of my interview today with Sen. Barack Obama.  Tune into WORLD NEWS WITH CHARLES GIBSON tonight to see the full report.  —  JAKE TAPPER: What is your reaction to the news that Sen. Kennedy has a brain tumor?  —  BARACK OBAMA: Well, it's heartbreaking.