WASHINGTON (CNN) -- He hasn't formally declared that he's running for president yet, but former Massachusetts Republican Gov. Mitt Romney continues to rack up endorsements from key campaign states and assemble veteran staff members.

Former Iowa House Speaker Brent Siegrist, and former first congressional district candidate Brian Kennedy will serve on Romney's Iowa leadership team, the campaign announced Tuesday.

Romney, who traveled to Iowa last weekend, called the Hawkeye State "critical" and said Siegrist and Kennedy help him "continue to have a strong presence in Iowa."

The Massachusetts Republican has also recruited James Bopp, Jr., a veteran GOP lawyer focusing on pro-life issues, to serve as a "special advisor on life issues."

"As Governor, Mitt Romney has stood side-by-side with those seeking to protect the weakest and most innocent of our society," Bopp said Tuesday in a statement. "In one of our country's most liberal states, he has acted to protect the sanctity of life."

-- CNN Ticker Producer Alexander Mooney