US President Barack Obama was projected by TV networks Tuesday evening to win swing states of Pennsylvania, Wisconsin and New Hampshire in the presidential elections, getting the three states' 34 electoral votes.

Other swing states remain too close to call, including Virginia, Florida and Ohio.

Obama and Romney are neck and neck in total electoral votes garnered for the moment, but the sweep so far by Obama of swing states adds to the difficulty of Romney's uphill battle in the grab for swing states. Under US election system, a candidate must get 270 of the 538 votes in the Electoral College to win the presidency.

Obama easily carried a host of "deep blue" states including Illinois, Maryland and New Jersey, while Romney prevailed in "deep red" states including Kentucky, Indiana and Georgia.

In addition, the Republican Party is projected by Fox News to keep the House of Representatives, increasing its majority. Going into the election, the GOP controlled the House 249-193.

The Election Day began with midnight voting in a pair of small towns in New Hampshire, and expanded across the nation after 5 a.m. Voters lined up from New York to Florida to cast their ballots.

Although figures haven't come in, US media outlets are reporting heavy turnout in the election. Early exit polls showed 73 percent of voters were white, 13 percent were African American, 10 percent Latino and 3 percent Asian.

In preliminary results from early voters in the national NBC News exit poll, 52 percent said America was on the wrong track while 46 percent said the nation was "generally going in the right direction."

Not surprisingly three out of five voters Tuesday said the economy was the most important issue facing the country, but poll respondents were divided as to what specific economic challenge loomed largest.

In picking the biggest economic problem facing people like yourself, 39 percent chose unemployment, 36 percent said rising prices, while 14 percent said taxes were the biggest problem and 7 percent said housing.