Tens of thousands gathered Saturday at the State Capitol in support of the ongoing effort to recall Gov. Scott Walker, the largest such rally since the historic month-long protests over collective bargaining ended in March.

Department of Administration officials estimate 25,000 to 30,000 people filled the square, marching through the cold drizzle, holding signs and chanting seemingly every possible derivation of "Recall Walker."

U.S. Rep. Tammy Baldwin, a Democratic candidate for the U.S. Senate, was in the crowd. So was Ed Schultz, MSNBC talk show host and liberal firebrand.

A small group of about 50 Walker supporters made a brief appearance. But they weaved through a collection of teachers, students and organized labor officials unified in their desire to remove Walker from office.

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"He never campaigned on limiting collective bargaining," said Jeff Kravat, a member of the local chapter of MoveOn.Org and a recall volunteer. "His hit on collective bargaining was a stealth campaign and it was the worst sort of overreach possible."

That same message was trumpeted earlier in the day by former Democratic U.S. Sen. Russ Feingold...