The scene in the New Hampshire office is one common to any nascent U.S. presidential campaign in the state that holds the country's first primary contest: Young staffers peck away at laptops and unpack boxes of signs with their candidate's name.

But the Democrat they are working for, U.S. Sen. Elizabeth Warren of Massachusetts, adamantly denies plans to seek the presidency.

Backed with $1.25 million from the liberal advocacy groups MoveOn.org and Democracy for America, the group Run Warren Run has opened offices in New Hampshire and Iowa, contending that Warren's message of populist economics could propel her into the White House in 2016.