(CNN) Hundreds of veterans of Barack Obama's campaigns and administration have signed on to endorse Sen. Elizabeth Warren for president, as multiple Democratic presidential candidates compete to claim the popular former president's political coalition and legacy.

With the Iowa caucuses less than two months away, more than 200 Obama alumni joined a signature-gathering effort led by a pair of former senior Obama aides, Sara El-Amine and Jon Carson. Among other roles, El-Amine was national director of Obama's 2012 re-election campaign, while Carson was a national field director for Obama's 2008 campaign prior to joining the administration. Both served as executive directors of Organizing for America, the Obama grassroots organizing network.

The list of endorsers shared with CNN includes Robert Ford, ex-US ambassador to Syria, and Sean Carroll, a former senior official at USAID. It also features Obama alumni who are currently working on the Warren campaign full-time including in senior-most positions, like Warren chief strategist Joe Rospars, senior adviser Emily Parcell, national political director Rebecca Pearcey and national director of public engagement Alencia Johnson.

In an interview with CNN, El-Amine and Carson touted the "incredible diversity" of the group that has come out in support of Warren. The 200-plus names were collected in under a week, and they planned to continue growing the list, they said.

"We are a group that really uniquely knows that electability is self-determining and that oftentimes it's the people with the boldest vision and the most unlikely candidacies early on who can really shift the field," El-Amine said. "Sen. Warren really has the zest and the grit and the gumption and the audacity that we loved that President Obama really embodied."

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