From CBSnews.com:

Mitt Romney has closed the gap with President Obama among registered voters, a CBS News/New York Times poll released Wednesday found, putting the former Massachusetts governor in a dead heat with the president for the White House.

Mr. Obama and Romney each received support from 46 percent of registered voters when asked who they would vote for if the election were held today. In March, a CBS News/New York Times survey found that Mr. Obama held a slight advantage over Romney of 47 percent to 44 percent.