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On the Republican side, Kevin Madden, spokesman for Mitt Romney, said the former Massachusetts governor is "not in favor of legalization of marijuana, and that includes medical purposes."

The campaign for Arizona Sen. John McCain did not respond immediately to questions. But the Marijuana Policy Project, which advocates decriminalization, says both Republicans have told its supporters they oppose that move, including in medical cases.

When asked by The Times about decriminalizing marijuana, the Obama campaign reiterated the candidate's opposition to legalization. "Senator Obama does not believe in legalization of marijuana, but agrees with President Bush that long minimum sentences for first-time drug users may not be the best way to occupy jail space or heal people from their disease," Obama spokesman Tommy Vietor said.

The campaign went on to say that, as president, Mr. Obama "will review drug sentences to see where we can be smarter on crime and reduce the blind and counterproductive sentencing of non-violent offenders, and revisit instances where drug rehabilitation may be more appropriate." His campaign later stated that Mr. Obama "always" has supported decriminalizing marijuana.

Mr. Obama's differing answers on marijuana are among a half-dozen conflicts between positions he took while running for Senate in 2004 and those he now articulates while running for president, a review of debate tapes shows. Other conflicts range from ending the embargo against Cuba to providing health care for illegal immigrants.

The Times obtained video footage of the public debates from a variety of sources, ranging from open sources such as YouTube to political operatives who oppose Mr. Obama's presidential campaign or his Senate bid four years ago in Illinois. Mrs. Clinton's campaign, for instance, recently released footage on its Web site of a 2004 speech in which Mr. Obama spoke about universal health care.

Check back for a full report on Mr. Obama's conflicting positions in tomorrow's editions of the newspaper.