Updated

Former President Bill Clinton urged Wisconsin Democrats to vote against Gov. Scott Walker in Tuesday's recall election, saying the Republican has governed without compromise or honest negotiation.

Clinton rallied voters Friday in Milwaukee, a Democratic stronghold and home of Walker's challenger, Democratic Mayor Tom Barrett. The former president was the latest in a string of high-profile Democrats who have campaigned on Barrett's behalf in recent days.

Clinton told the crowd at a downtown riverfront park that the states recovering from the economic downturn are those in which members of both parties are working together.

"They are involved in creative cooperation, not constant conflict," he said, later adding, "Cooperation works. Constant conflict is a dead-bang loser."

Clinton's comments were a clear dig at Walker after the state divided last year over the governor's push to effectively end collective bargaining for most public workers. Walker and Republican leaders rammed his proposal through the state Legislature despite weeks of protests at the state Capitol and Senate Democrats fleeing to Illinois in an ultimately futile effort to block a vote.

That's no way to govern, Clinton said. Real leaders get stakeholders together, listen to their concerns, treat them with respect and make sure everyone moves forward together, he said.

"You get out of a ditch when people stand on each others' shoulders and somebody gets to the top and then reaches down and pulls everybody else up," Clinton said.

The recall election was spurred by anger over the collective bargaining law. Local election clerks who track absentee voting through a statewide computer system had issued at least 182,000 absentee ballots by midday Friday, foreshadowing what is expected to be heavy turnout next week.

Almost 231,000 absentee ballots were cast during the 2010 gubernatorial race, which saw Walker beat Barrett by about 125,000 votes. However, only a third of Wisconsin clerks use the tracking system, which means the actual number of ballots issued so far in the recall is likely much, much higher. Friday was the last day for voting absentee in clerk's offices or requesting a ballot by mail.

Walker campaigned Friday with South Carolina Gov. Nikki Haley, who has called herself a "union buster" and considers her state's low union membership rate an economic development tool.

Clinton, the biggest Democratic name to visit Wisconsin in the recall, cautioned that Republicans would interpret a Walker win as authorization to continue what he called a divide-and-conquer strategy, and that they'd feel empowered to break unions and continue attacking the middle class.

"Ordinarily I'm against recall elections," Clinton said, "... but sometimes it is the only way to avoid a disastrous course."

Clinton's visit is a nod to the importance of turnout in Milwaukee, a Democratic stronghold where Barrett must do well in order to win the state.

President Barack Obama has kept his distance from the union fight as his own re-election efforts near this fall. Wisconsin, with its 10 electoral votes, is a key part of his path to victory.

Maryland Gov. Martin O'Malley, who chairs the Democratic Governors Association, fired up Democratic volunteers Thursday in Wisconsin's other major Democratic city, the state capital of Madison. His visit came after U.S. Rep. Debbie Wasserman Schultz, head of the Democratic National Committee, made a similar stop Wednesday in Racine.

"We don't want to wake up after this election and say, `If only,"' O'Malley told volunteers. "Now is the time to turn on the afterburners."

O'Malley said he expected the race to be so close that it could come down to a couple of votes in every precinct. With few undecided voters, strong turnout by either party could swing the election.

Walker has been leading in polls released by the Marquette University Law School during the past two weeks. The most recent one released Wednesday showed Walker with a 7-point edge, but that was within the margin of error of 4.1 percentage points either way.

The recall election has been unlike anything seen before in Wisconsin, with at least $62 million spent by the candidates and outside groups so far, based on a tally released Thursday by the government watchdog group the Wisconsin Democracy Campaign.

Walker was the top spender at $29 million, with Democrats including Barrett spending about $4 million. Outside groups have spent $21 million, and issue ad groups that don't have to disclose their spending have put in at least $7.5 million.