The Senate race in Wisconsin is being shifted to a "Toss Up," signifying Democrats losing ground in the crucial state.

One ad by GOP candidate Eric Hovde criticizes Sen. Tammy Baldwin and her wealth adviser partner, ending: "Tammy Baldwin; in bed with Wall Street."

Wisconsin Democratic Sen. Tammy Baldwin's re-election race in the pivotal swing state is proving to be much closer than previously anticipated, according to multiple reports. Baldwin, who faces off against Republican challenger Eric Hovde in November’s highly contested elections,

Wisconsin’s U.S. Senate race hardly feels like a referendum on the Democratic incumbent. Can the Republican challenger turn the tide?

The race is closely watched as one that could help determine the balance of power in the Senate, where Baldwin is seeking her third term.

The Wisconsin Senate race has shifted from “lean Democratic” to “toss-up” in the latest rating change from Cook Political Report, dealing a blow to Democrats as they seek to hold on to their slim majority in the upper chamber.

The Cook Political Report on Tuesday shifted the Wisconsin Senate race from “lean Democrat” to “toss up,” handing Republican Eric Hovde a boost as he tries to unseat Sen. Tammy Baldwin (D-Wis.). Baldwin,