"Scott Walker is a national disgrace," Trumka said in the statement.
Johnson has $2.75 million in cash on hand for race against Feingold.
Seven potential candidates have state records to boast about, or to defend.
At look at the sitting Republican governors who might run for president.
It will create a downward spiral in wages for both union and non-union workers.
Why aren't other Republican governors following Scott Walker's lead?
The 2012 GOP vice presidential nominee is close to his home state's governor Scott Walker.
Paul Ryan is going to bat for Wisconsin Gov. Scott Walker.
The governor, who is in a tough election fight, said he wants jobs that paid much more.
A GOP primary race in Wisconsin’s 6th Congressional District is now too close to call.
What relevance does Washington have once America is all grown up?
A federal judge sided with opponents who argued it disenfranchises poor and minority voters.
Walker enters the race as the favorite to win Iowa’s caucuses.
“They'll have enough for an actual ‘Hunger Games,’ ” Obama says of GOP field.
Gov. John Kasich criticized the lawsuits as “demagoguery” given that other states allow far fewer...
But Sen. Ron Johnson (R-Wis.) defended the "content" of the letter.
The Wisconsin faces criticism over his comments comparing union protesters to ISIS.
Expanding Medicaid could save his state $400M over the next two years.
Ad says country can't look to the past for change.
Walker could be a real contender in 2016. But only if he wins reelection first.
The remark by Rep. Debbie Wasserman Schultz is drawing heavy blowback.
The Republicans appear at odds over the best strategy for Walker's reelection.
Super-PAC contributions are the ultimate "black money" of American politics.
The 18-term Wisconsin Republican faced a primary challenge from state Sen. Glenn Grothman.