Feingold spokesman John Kraus says: "the exit polls we have seen show it very close, we are looking at a very long night."

CNN exit polls:  Johnson 50, Feingold 49 -- but a wide margin of error. . . .

Milwaukee election authorities were faced with "a last-minute rush for extra ballots" late Tuesday, partly because voters were confused by the ballot layout and voted for too many gubernatorial candidates, a city election official said.

The city Election Commission sent out a total of about 15,000 extra ballots to roughly half of Milwaukee's wards, but that caused only minor delays in voting, said Neil Albrecht, the commission's deputy director. Many of those ballots were needed to replace others spoiled by voters who tried to vote for both a major-party ticket and an independent or third-party candidate in the race for governor and lieutenant governor, he said.

"We even heard that someone thought 'Libertarian' was 'librarian,' " and that they were voting for a separate office, not a lieutenant governor candidate, Albrecht said. The Milwaukee library director is a mayoral appointee, not an elected office.

There will be some 'splaining to do about those exit polls that said it would be close. . . .

And in the gubernatorial race, Wisconsin also is called for the Repub.  Another state goes red.

AP reports that elections officials in Brown County printed almost 23,000 more ballots after voter turnout came in higher than expected.

Exit polling shows the race essentially tied, though Giannoulias' side got some early good news: Moderates are breaking for him 51 percent to 42 percent, according to the exit polls.

African-Americans voted 94 percent to 3 percent for Giannoulias, according to the exit polls. White voters went 61 percent to 34 percent for Kirk, the polls showed.

Women broke for Giannoulias 49 percent to 46 percent. Men went for Kirk 49 percent to 45 percent, the polls found.

Voters under 40 went for Giannoulias; voters over 40 went for Kirk, the polls showed.

Both sides are watching the numbers of votes coming in from Chicago -- Where Giannoulias is strongest -- and the far suburbs and downstate, where Kirk dominates.

In 34 states around the country, candidates are likewise watching the returns, but Illinois could be the most important for one or two reasons.

The first is that Illinois' new senator will be sworn in early, around Thanksgiving Day, to serve out the remainder of Barack Obama's senate term. If Kirk wins, he could provide the 42nd vote to block bills the Democrats might try to pass in the lame duck session before the new senators -- most of them expected to be Republicans -- take office in January.

The second reason is largely symbolic: This is Obama's old senate seat and both parties have poured millions of dollars into this race for the bragging rights of capturing the president's old seat

As CBS News Correspondent Jeff Glor reports, .the former GOP vice presidential nominee backed 43 candidates for the House. Thirty of them won, with races involving nine others still undecided.

Her record in Senate races was closer: She endorsed 12 candidates. Seven won.