(The Center Square) – Four days from Election Day, the outcome of the U.S. Senate race in Wisconsin –one of the closest in the nation – could rest on the decision of a small group of undecided voters, according to a recent poll. Marquette Law School polled 834 registered and 753 likely Wisconsin voters from Oct. 16-24. The partisan makeup of the poll is 39% Republican, 31% Democratic, and 34% Independent. In a head-to-head matchup, the survey found Democrat incumbent Sen. Tammy Baldwin has maintained a slight edge over Republican challenger Eric Hovde, capturing the support of 51% versus 48% o…