Biden and Dodd both received Iowa endorsements this week.
On Friday, state Rep. Ray Zirkelbach said in a statement that he's backing Dodd for president because of the Connecticut Democrat's "clarity and leadership on working to end the war."
Zirkelbach, a sargeant in the Iowa National Guard, returned from Iraq in August. He is also a Purple Heart recipient.
On Thursday state Rep. McKinley Bailey, who at age 26 is also the youngest serving Democrat in the Iowa state legislature, chose to endorse the Delaware Democrat.
"When I first learned of Sen. Biden's plan, I realized that was the ticket, a political solution, not a military one," Bailey said in a statement. Bailey served in the U.S. Army in Iraq in the 313th Military Intelligence Battalion as part of the 82nd Airborne Division.
In recent polls, Dodd and Biden have consistently been in the single digits.
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-CNN Iowa Producer Chris Welch