Retiring Sen. Tom HarkinTom HarkinDemocrats are all talk when it comes to DC statehood The Hill's 12:30 Report Distance education: Tumultuous today and yesterday MORE (D-Iowa) says Hillary ClintonHillary Diane Rodham ClintonGrassley blasts Democrats over unwillingness to probe Clinton GOP lawmakers cite new allegations of political bias in FBI Top intel Dem: Trump Jr. refused to answer questions about Trump Tower discussions with father MORE should start visiting Iowa more if she plans on launching a 2016 presidential bid.

"If she's going to run, she should start getting out here," Harkin told the Quad-City Times on Friday.

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He touted Clinton as a strong candidate that "would bring a lot of experience and knowledge that we haven't had in that White House for a long long time. "I mean just from the git go ... I think she's proven herself over all these years," Harkin added.

The 30-year Senate Democratic veteran, who himself ran for president, also encouraged Maryland Gov. Martin O'Malley and Vice President Joe BidenJoseph (Joe) Robinette BidenOvernight Tech: FCC won't delay net neutrality vote | Google pulls YouTube from Amazon devices | Biden scolds social media firms over transparency Medicaid funds shouldn't be used to subsidize state taxes on health care Biden hits social media firms over lack of transparency MORE to stump in his state.

The race to replace Harkin in the Senate is heating up. Rep. Bruce Braley is the only Democrat in the race so far. Republicans include State Sen. Joni Ernst, businessman Mark Jacobs and former attorney general Matt Whitaker.