Late in the evening on Halloween about 100 people gather around the campfire in "Bainport," Illinois, marking the 50th day of the encampment.

Democrats have a one-seat majority in the Wisconsin Senate after three Republicans lost seats in historic recall elections, but 16 seats are up for grabs in November, and with them the balance of power. In recent weeks, many have focused on the race between Congresswoman Tammy Baldwin and former governor Tommy Thompson, which may determine who holds the majority in the U.S. Senate, but the state Senate races are significant because many Wisconsinites are concerned about having a firewall against embattled Governor Scott Walker's 2013 legislative agenda.

Karl Rove's dark money group Crossroads GPS and Super PAC American Crossroads are spending $10.5 million on Senate ads in the final week of the election, which is likely the largest one week buy from any group this election cycle, Politico reports.