During his weekly Thursday conference call with reporters, U.S. Sen. Tom Harkin, D-Iowa, was asked about reports that Iowa Democratic Party Chairwoman Sue Dvorsky will step down from her post in January 2013.

Dvorsky, who lives in Coralville, became the chairwoman in summer 2010, and Harkin said she had done well in the position through her "energy and vitality and spirit" that pushed rank and file Democrats to work hard to elect Democrats.

"Sue Dvorsky, she was just tireless," he said.

Harkin said proof that Dvorsky had a beneficial tenure was in the fact that Democrats recently retook the statewide lead from Republicans in the number of registered voters for the party.

Harkin was asked if he would support state Rep. Tyler Olson, D-Cedar Rapids, for the chairmanship. Harkin said he has been missing calls with Olson and had no comment on whether he was best suited for the job. Harkin said he would consult Iowa Senate Majority Leader Mike Gronstal and others before he would weigh in on the upcoming vacancy.

The Iowa Democratic Party Central Committee will vote on a new chairman or chairwoman.

Norm Sterzenbach is also departing as IDP executive director, a job he's had since December 2006.

"I hate to see them go, but I understand that people move on," Harkin said.