Sen. John McCain (R-Ariz.) won the Republican Connecticut presidential primary Tuesday while Sen. Barack Obama (D-Ill.) scored an upset over Sen. Hillary Clinton (D-N.Y.) in the Democratic contest.

Obama's victory comes in a state long thought to be a Clinton stronghold. Clinton held a double-digit lead in polls of likely voters in January, but Obama closed the gap as the once-crowded Democratic field narrowed to two.

The closeness of the race was underscored in the final days of the campaign. Clinton made two visits, including a stop Monday at Yale University, where she attended law school.

Monday evening, Obama drew more than 15,000 people to a packed rally at the XL Center in Hartford.

McCain swept an easy victory in the primary. It was the second Connecticut GOP presidential primary win in eight years for McCain. In 2000, he beat George W. Bush, who was born in New Haven and went on to win the nomination and the presidency that year.

McCain also had the backing of Gov. Jodi Rell and independent Sen. Joe Lieberman, who was the other co-chairman of the state effort.

Click here for Blumenthal?s reaction to Obama?s win

News 12 Connecticut Super Tuesday Results

AP wire reports contributed to this story.