Hillary Clinton won the New Jersey Democratic primary Tuesday after a tight race against Barack Obama, FOX News projected, shortly after John McCain easily won the state's Republican primary.

For much of the evening, the contest between Clinton and Obama was too close to call in New Jersey, a state with more Democrats than Republicans and twice as many unaffiliated voters.

But Clinton prevailed.

"Tonight is your night. Tonight is America's night," she told a cheering crowd of supporters. "We know that what we need is someone ready on Day 1 to solve our problems."

She lambasted the current administration and made reference to a campaign tactic Republicans used against Democrats in the 2004 presidential election.

"The Republicans want eight more years of the same," Clinton said to boos and jeers from the audience. "Let me be clear: I won't let anyone Swift Boat this country's future."

McCain grabbed support from party moderates and seized on an early exit by the one-time favorite, New Yorker Rudy Giuliani.

"Tonight the Republican voters of New Jersey have said John McCain is the best candidate to win in November and best able to be a great president on day one," said state Sen. Bill Baroni, McCain's New Jersey campaign chairman.

McCain picked up all 52 of the state's Republican delegates. Mitt Romney finished second but picked up no delegates in the winner-take-all contest.

Moderate Republicans strongly favored McCain in New Jersey, as did GOP voters worried about the economy, according to early results of an exit poll conducted for The Associated Press and the television networks.

However, McCain faced opposition from conservatives and those unhappy about his position on illegal immigration.

New Jersey joined 23 other states holding primaries or caucuses Tuesday.

McCain, the Republican front-runner, was all but unchallenged in winner-take-all primaries in New York and Connecticut. He looked for a home-state win in Arizona as well.

The Clinton-Obama contest appeared far closer, with Obama winning Georgia.

At stake for the Democrats are 107 of 127 total delegates, which will be awarded proportionally.

The other 20 delegates -- often referred to as super delegates -- are party and elected officials who can support whomever they choose, regardless of Tuesday's outcome. Of the super delegates who have endorsed a candidate, Clinton appeared to be ahead, 13-1.

Delegates cast their votes at each party's convention in the summer. Nationwide, a majority of 4,367 delegates are needed for the Democratic nomination, and a majority of 2,380 delegates for the Republican nomination.

New Jerseyans who voted Tuesday had their first shot in decades to influence their party's nomination for president because the state moved its primary from June to February.

"You feel like you get to be counted fully," said voter Devon Berry, 34, as he voted in Point Pleasant. "For a state with such a large population as New Jersey to have a say is absolutely a relief for people who care about the direction this country is taking."

Some 4.8 million residents were eligible to vote, and election officials were reporting strong voter turnout.

The Associated Press contributed to this report.