Republican contender Marco Rubio struggled at a presidential debate on Saturday, potentially confounding his bid to emerge as Donald Trump's chief rival in New Hampshire.
The front-running GOP residential candidate threatened to change his jokey style because it results in him being misrepresented.
Republicans seeking the White House in the November 2016 presidential election quickly voiced their disagreement. Senator Marco Rubio vowed to approve the pipeline if he wins the White House. Louisiana Governor Bobby Jindal, also a White House hopeful, accused Obama of giving in to "radical environmentalists."
The outcome may be like "Seinfeld": amusing, full quirky characters but with no clear message, Politico's Ben White says.
Campaigns are using Facebook and Twitter ad targeting methods to reach voters. Sanders also likes Snapchat.
John Kasich tells CNBC he is open to lowering the corporate tax rate below the 25 percent level he has proposed.
CNBC's John Harwood sat down at a Concord bar and restaurant and asked some New Hampshire voters questions about this election.