(AP) - Sen. Hillary Rodham Clinton won NewHampshire's Democratic primary Tuesday night in a startling upset,defeating Sen. Barack Obama and resurrecting her bid for the WhiteHouse. Sen. John McCain powered past his Republican rivals and backinto contention for the GOP nomination.

Clinton's victory capped a comeback from last week's third-placefinish in the Iowa caucuses and raised the possibility of a longbattle for the party nomination between the most viable blackcandidate in history and the former first lady, who is seeking tobecome the first woman to occupy the Oval Office.

McCain's triumph scrambled the Republican race as well.

"We showed this country what a real comeback looks like," theArizona senator told The Associated Press in an interview as hesavored his triumph. "We're going to move on to Michigan and SouthCarolina and win the nomination."

Later, he told cheering supporters that together, "we havetaken a step, but only a first step toward repairing the brokenpolitics of the past and restoring the trust of the American peoplein their government."

McCain rode a wave of support from independent voters to defeatformer Gov. Mitt Romney of Massachusetts, a showing that reprisedthe senator's victory in the traditional first-in-the-nationprimary in 2000.

It was a bitter blow for Romney, who spent millions of dollarsof his own money in hopes of winning the kickoff Iowa caucuses andthe first primary - and finished second in both. Even so, thebusinessman-turned politician said he would meet McCain next weekin the Michigan primary, and he cast himself as just what thecountry needed to fix Washington. "I don't care who gets thecredit, Republican or Democrat. I've got no scores to settle," hetold supporters.

After Iowa, Clinton and her aides seemed resigned to a secondstraight setback. But polling place interviews showed that femalevoters - who deserted her last week - were solidly in her NewHampshire column.

She also was winning handily among registered Democrats. Obamaled her by an even larger margin among independents, but hesuffered from a falloff in turnout among young voters compared withIowa.