On this day in 1968 Martin Luther King is assassinated in Memphis. On to today's top stories:

"For Obama, a 2-to-1 Edge Over Clinton in Donations" (Leslie Wayne, New York Times) About this time last year, Obama's fundraising prowess sent a shot across Hillary Clinton's bow. For March 2008, the mighty Obama Armada has added another $40 million, roughly double what Clinton has managed.

"McCain returns $3m in checks as he considers public funding" (Scott Helman and Sasha Issenberg, Boston Globe) By returning $3 million to contributors, John McCain might be readying himself to accept public funding. If he does, he could put pressure on Obama (or Clinton) to accept public financing also.

"Clinton Camp Feels Spent, and Outspent" (Matthew Mosk, Washington Post) Says one Clinton aide, "I'll tell you, after a year of doing this, it's like asking me to run a half-marathon after I've run a marathon." With it trailing in fundraising, the Clinton campaign is finding itself flanked on every front: organization, advertising, endorsements.

"Obama's Support Softens in Poll, Suggesting a Peak Has Passed" (Adam Nagourney and Megan Thee, New York Times) A NYT/CBS poll finds that Obama's popularity, especially among men and upper-income voters, seems to have peaked in February. In that month, 67% of men wanted the party to nominate him. Today, that number is 47%.

"Clinton Denies Obama Electability Remark" (Beth Fouhy, Associated Press) Yesterday Clinton denied -- "That's a no" -- telling Bill Richardson that Obama can't win in November. Or was she only saying that she won't discuss private conversations? It's a bit hazy. In any case, Clinton did say that she believed a Democrat will be in the White House next year.

"McCain Warned Against Naming Romney" (Ralph Hallow, Washington Times) When McCain arrives in Prescott, Ariz., tomorrow to for a rally, he's going to be met with a full-page ad in the town's Daily Courier warning him not to pick Mitt Romney as his running mate. The ad was taken out by 20 social conservatives who feel that Romney's past positions on abortion and gay marriage makes him unfit to be a "heartbeat" away from the presidency.

"Clinton Aide Met on Trade Deal" (Susan Davis, Wall Street Journal) Mark Penn, Clinton's chief campaign strategist, met with Colombian officials on Monday to discuss a bilateral free-trade agreement that Clinton opposes. But Penn, who didn't comment for the article, was apparently not there as part of the campaign but as part of his job as chief executive of Burson-Marsteller Worldwide.

"Clinton Agrees to NC Debate on April 27" (Associated Press) Time for another! Having been challenged by Obama to debate, Clinton finally accepted. The date, April 27, should come after Clinton wins Pennsylvania, although that outcome is now in doubt.

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