WASHINGTON — Senator Obama raised a record $55 million in February for his presidential campaign, eclipsing Senator Clinton’s own substantial fund-raising for the month. All told, Mr. Obama has raised $193 million during his yearlong bid for the White House.

The campaign’s announcement today came two days after Mr. Obama lost three out of four primaries to Mrs. Clinton. Mrs. Clinton’s victories stopped his winning streak and extended the race into an unpredictable future.

Mr. Obama’s February total was his second fund-raising record. He raised $36 million in January, more than any other presidential candidate who has ever been in a contested primary.

More than $54 million of the February money was for the primary election. His combined January and February totals nearly matched what he raised last year. The campaign said it raised $45 million online in February and had 385,000 new contributors for a total of more than 1 million donors.

Riding her victory wave, Mrs. Clinton’s camp announced today that she raised $4 million online since Tuesday’s presidential primary successes in Ohio, Texas, and Rhode Island.

The Clinton campaign said it had raised the money from the time polls closed Tuesday through noon today. It reported 30,000 new donors. The influx of money made their online total raised for this month $6 million, the campaign announced.

Mrs. Clinton raised an impressive $35 million in February, a significant recovery from January when Mr. Obama raised more than twice her total. But Mr. Obama has outpaced her both in fund-raising and spending during the nominating contests.

“We’re going to have the funds we need to keep this campaign going, to keep Hillary Clinton’s message out there,” a senior adviser, Ann Lewis, said in a teleconference with reporters.

Past victories have also caused upticks in giving. The Clinton campaign, for instance, raised more than $1 million in the 24 hours following her New Hampshire victory on January 8. Mr. Obama raised $1.2 million the day after winning the Iowa caucuses and he raised even more in the 24 hours after losing in New Hampshire.

Mrs. Clinton had to lend her campaign $5 million at the end of January, but has seen her finances improve since then. She reported raising $34 million for the primary in February.

Mr. Obama and his allies outspent her in Texas and Ohio in advertising.

Both campaigns have been the top fund-raisers of the entire presidential field, raising $100 million each in 2007.