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As Gov. Scott Walker continues to be floated as a potential last-minute challenger to presumptive GOP nominee Donald Trump, the governor insists he's focused on running for re-election in Wisconsin — that is, if he decides to do so.

Walker says he won't make a decision on another gubernatorial bid until after the state budget is completed next year. In the meantime, speculation has begun over which Democrats will run against him in 2018.

Here's who's on the list so far:

Tim Cullen: The former senator told WisPolitics this week he is considering a run, but is "a ways" from making a decision. The Janesville Democrat served two separate stints in the state Senate — one from 1975 through 1987, and one from 2011 through 2014. He served as Senate majority leader for several years in the 1980s, and spent one year as head of the state Department of Health and Family Services under Republican Gov. Tommy Thompson. 

Cullen briefly considered running in the 2012 recall election against Walker, but opted not to, citing fundraising concerns. At the time, he described unions' attitude toward his campaign as "respectful indifference."

Known as a moderate in the Legislature, Cullen worked with Republicans in an attempt to broker a deal after he and the 13 other Senate Democrats went to Illinois hoping to block a vote during the fight over Walker's Act 10 legislation. In a book published last fall, Cullen detailed that fight and his experiences in Wisconsin government.

Sen. Kathleen Vinehout: The Alma Democrat told the Wisconsin State Journal last month that, after surveying delegates at the Democratic Party of Wisconsin convention, "they want me to run." Still, she said, she won't make a decision until early next year.

Vinehout has served in the state Senate since 2007. She won 4 percent of the vote in the Democratic primary in the 2012 recall election, and briefly considered running in 2014. She decided not to run after injuring her arm in a car accident. 

Representing the western part of the state, Vinehout has appeal as a candidate not from the liberal strongholds of Madison and Milwaukee. But she could struggle to pull in endorsements and dollars from reproductive rights groups like Planned Parenthood, which rescinded its 2006 endorsement of her after she authored an amendment that would have allowed pharmacists to refuse to fill certain prescriptions, including contraceptives, based on their religious beliefs.

Senate Minority Leader Jennifer Shilling: In the Senate since 2011, Shilling was elected to lead her Democratic colleagues in 2014. The La Crosse Democrat served in the Assembly for 11 years before entering the Senate. 

Shilling was named one of the Washington Post's "40 Most Interesting Women in Politics" last year, sharing the ranks with politicians including Republican former Secretary of State Condoleezza Rice and Democratic Sen. Elizabeth Warren. 

Her name has been floated by fellow Democrats for at least a year as a strong contender, but Shilling hasn't said much about it. Instead, she says, she's focused on the 2016 ballot.

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Rep. Dana Wachs: The Eau Claire Democrat was elected unopposed to the state Assembly in 2012. He faces a Republican challenger this year, and has said he's focused on that race. His name only recently emerged as a potential gubernatorial candidate, and that chatter picked up at the party's state convention. 

Dane County Executive Joe Parisi: Parisi's name is a familiar one in gubernatorial speculation, but he's often dismissed as a Madison liberal who may struggle to appeal to voters throughout the state. 

Parisi served in the state Assembly for six years before he was elected county executive. 

Asked about a gubernatorial bid in May, Parisi said he's "not ruling it out." But first, he's running for re-election in 2017.

U.S. Rep. Ron Kind: Kind is another frequently mentioned name, having represented the state's 3rd Congressional District since 1997. The La Crosse lawyer is chairman of the New Democrat Coalition, a congressional organization that describes itself as the party's "pro-growth, fiscally responsible wing."

Kevin Conroy: Conroy, CEO of Madison biotech company Exact Sciences, last considered a run for governor in 2009. He drew praise at the time from Democratic then-Gov. Jim Doyle. Conroy has since indicated he may still be interested in public office, and his name was frequently mentioned by Democrats looking at 2018. His company is still recovering from plummeting stock prices since the launch of its colon cancer screening test, but shares started climbing back up earlier this month. But this week, he told the Milwaukee Journal Sentinel he is not considering running for governor, opting instead to focus on the company.

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Jessie Opoien covers state government and politics for the Capital Times. She joined the Cap Times in 2013 and has also covered Madison life, race relations, culture and music. She has also covered education and politics for the Oshkosh Northwestern.