NBC/WSJ poll: Heading into conventions, Obama has four-point lead

(Photo: Matt Sullivan / Getty Images)

After Mitt Romney selected his vice presidential running mate, and just days before the political conventions kick off next week, President Barack Obama maintains his advantage in the race for the White House, according to the latest NBC News/Wall Street Journal poll.

A Democratic ticket featuring Obama and Vice President Joe Biden gets support from 48 percent of registered voters, and a Republican ticket of Romney and new running mate Paul Ryan gets 44 percent.

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