On this day in 1770 British troops fired on an angry mob in Boston -- an event that would become known as the "Boston Massacre." On to today's top stories:

"Clinton's Victories Mean the Race Goes On - and May Get Ugly" (Steven Thomma, McClatchy Newspapers) As reporter Thomma notes, Clinton won't be able to catch Obama in delegates. But what she did last night was inform the DNC upper echelon and superdelegates that this race is not over.

"Now, McCain Looks to the Fall" (Laura Meckler, Wall Street Journal) It might have taken a little longer than he had hoped, but it's official. Of course winning in November is the end goal, but in a primary campaign full of stories, John McCain's is perhaps the most unlikely -- or the most likely, depending on when you begin the assessment.

"Big Caucus Turnouts Jam Dallas-area Polling Places" (Dallas Morning News) Even as the networks were calling the race for Clinton, step-two of the so-called Texas Two-Step was still in full swing. Their result could sway the delegate total either way, meaning Clinton might have won the state but gained little in the delegate count.

"Obama Claims Math Still on His Side" (Tom Raum, Associated Press) And he's right: The math is on Obama's side, in terms of Clinton being unable to catch him in delegates. But the math is also on Hillary's side, in terms of Obama being unable to clinch the nomination. The math, in short, is becoming a moot point.

"Huckabee Drops Out of Presidential Race" (Angela Brown and Libby Quaid, Associated Press) Let's give Huckabee his due: He rose from an unknown governor to one of the leading politicians in the country, almost entirely on perseverance. Some will criticize Huckabee for staying in the race long after it was out of reach, but one must think that Huckabee, who has built a solid constituency, has ensured his political survival.

"With McCain Atop Ticket, Talk Shifts to Spot No. 2" (Michael Cooper, New York Times) Time is certainly on McCain side in choosing a running mate. With the Democratic race still very much in flux, however, McCain might have to make some assumptions in who stacks up best.

"Swing in Momentum May Alter Media's Focus" (Peter Canellos, Boston Globe) In addition to failing to clinch the nomination, Obama also has to deal with a suddenly assertive media. After weeks of Clinton campaign charges that the media was being soft on Obama, the tide turned in the last few days.

"Hillary Clinton's 'Kitchen-Sink' Campaign Pays Off" (Michael Tackett, Chicago Tribune) How much did Clinton's final offensive against Obama affect last night's vote? It's hard to gauge, and certainly Clinton's 10-point victory in Ohio suggests that she didn't necessarily need a strong finish. But in Texas, that "red phone" ad might have made the difference.

"Sentiment on Iraq Is Changing" (John McKinnon, Wall Street Journal) Even if the Democrats aren't quite there yet, the media is already turning toward general-election issues, and, specifically, how the success of the surge in Iraq alters the electoral game.

Get today's other election stories at RCP's Politics and Election page.