Johnson is going to be Blanched.
Not quite.
Losing 58-37 in a re-election would be about all that he would have in common with Blanche Lincoln. She was a political powerhouse as a conservative-to-moderate Democrat in Arkansas, a two-term Senator, winning two Senate elections before the Republican wave in the South dumped her. She won 62-38 in 1998 and 56-44 in 2004 in two fairly-good years for Republicans. Republicans maintained a 55-45 split in the Senate in 1998 and gained 5 Senate seats in 2004. Republicans made huge gains in 2010 largely by ousting incumbent Democrats, almost an inverse of 2006.
Face it -- the South has gone very far to the Right in its politics. Democrats can win in the South (Florida, Virginia and perhaps North Carolina), only in urban, high-minority-content districts -- and Republicans know enough to leave those areas alone in a sort of power-sharing that ensures that the other side has a voice but no power. Blanche Lincoln went down harder than any other Democratic incumbent, but after facing a primary challenge.
The district which Blanche Lincoln represented (AR-01, eastern Arkansas) used to be reliably Democratic. It is now R+14. Of course districts get redrawn, but a Democrat reliably represented that district until 2011. Other districts are R+8 (AR-02, central Arkansas including Little Rock), R+19 (AR-03, including Fayetteville and Wal*Mart headquarters), and R+14 (AR-04, including the rest of Arkansas... the most notable person from that district is Bill Clinton). I could say some more very hackish things about political trends in the Dixie... and I shall refrain.
Ron Johnson is a one-term Senator (and it will take some strange events to make him a two-term Senator). He won a narrow election (52-47) for Senate in his first-ever election for any public office in a wave election for Republicans. He is very far to the Right in a state that splits nearly 50-50 between Right and Left, which is not good for winning re-election. In a normal election year -- that is an election not a wave year for Republicans -- he loses. He needs a Republican wave to win re-election. Unlike Blanche Lincoln he is unlikely to face a primary challenge. Also unlike Blanche Lincoln he has never showed himself a solid winner in previous elections.
If anything, recent polling in Wisconsin suggests that the state will have a Democratic wave in 2016. Wisconsin is likely to be about as D in 2016 as Massachusetts. A Senator who votes as if he could win big in Oklahoma in a state likely to resemble Massachusetts in 2016 in political orientation will go down. Blanche Lincoln was close to the political center for America as a whole in a State veering rapidly to the Right and she seemed like a political powerhouse. That is a huge difference. Ron Johnson is practically a joke as a politician.