Madison’s longtime mayor, Democrat Paul Soglin, said Tuesday that he plans to formally launch a campaign for governor in a few weeks, which would make him the oldest of the nine top-tier candidates seeking to unseat Republican Gov. Scott Walker.

Soglin, 72, made the announcement on Twitter and Facebook. He’s been toying with entering the race since June, saying as recently as last week that he planned to launch his candidacy in mid-January, barring an unexpected development.

Reached by phone Tuesday by the Wisconsin State Journal, Soglin said he plans to make a formal announcement the second week in January and declined to comment further.

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