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Donald Trump is in cruise control in New Hampshire, doubling the poll numbers of his nearest challenger, unless that is, Mitt Romney gets in the race. Under that scenario, it would be Trump who would be getting doubled up on, according to a new poll out from the Boston Globe and Suffolk University.

Trump leads Marco Rubio 22 percent to 11 percent. Dr. Ben Carson is third, at 10 percent. If Romney entered the race, however, he would garner 31 percent to Trump's 15 percent.

A third Romney run has long been speculated. Romney declined to enter the race last January. Many observers thought he had assessed that the establishment lane and his 2012 donor base had been crowded out by Jeb Bush.

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