The possibility is already making Duckworth the target of attacks and criticism.
Duckworth has been making more television appearances as she emerges on the shortlist for VP.
"The emails are flooding my inbox. She is ramping up her campaign, doing tons of media appearances, making the most of her candidacy," ABC 7 Political Analyst Laura Washington said.
With the higher profile, Duckworth has come under attack. Fox News Host Tucker Carlson called the double-amputee combat veteran a "coward," "fraud" and "moron." Sen. Dick Durbin tweeted Duckworth is a national hero, and Carlson is a national embarrassment.
Tucker Carlson calling @SenDuckworth a “moron” and a “vandal” is pathetic. Tammy Duckworth is a national hero. Tucker Carlson is a national embarrassment.— Senator Dick Durbin (@SenatorDurbin) July 8, 2020
"Let's be real; Tucker Carlson calling Tammy Duckworth a coward is a just despicable, horrible thing to do," former Republican Congressman Joe Walsh said.
In 2012, then-Republican Congressman Joe Walsh was unseated by Duckworth after a bitter campaign. He said she would be a phenomenal attack dog for the Biden campaign.
"She is difficult to run against," Walsh said. "She is a woman who sacrificed both legs for this country."
If chosen, Duckworth would be the first woman of color nominee for vice president. State Rep. Theresa Mah, the first Asian American to be elected to the Illinois General Assembly, said Duckworth would be a great pick.
"I have known her for many years. I volunteered for her first run for Congress and in many ways that was the volunteer experience that got me really involved in politics in Illinois," Mah said.
Duckworth is one of several women under consideration by the campaign. Retired Law Professor Joel K. Goldstein has written two books about the vice presidency.
Goldstein said it's too early to predict who Biden will choose.
"You would have predicted Walter Mondale on July 8th, or George H.W. Bush or Dan Quayle or Sarah Palin or many of the other people who have selected," Goldstein said.
Duckworth challenged Carlson to walk a mile in her legs.
Does @TuckerCarlson want to walk a mile in my legs and then tell me whether or not I love America?— Tammy Duckworth (@SenDuckworth) July 7, 2020
Biden is expected to make his pick for vice president sometime in August before the democratic convention.