Feingold's Senate seat and where there are two open seats, Neumann's and retiring GOP Rep. Scott L. Klug's.
The number of open seats is lower in 1998 than it has been in the last several election cycles.
In 1998, there are only five open seats, three Democratic and two Republican.
By contrast, there were 13 open seats in 1996, nine open seats in 1994 and 16 open seats in 1992.
With the volatility of 2008, 26 people ran for two open seats.
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There are also races for three open seats in the state Assembly coming up in May, so even more movement could occur.
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In all, Republicans must defend 15 incumbents in addition to the four open seats next year, a number that could increase if Sen.
Democrats knocked off one GOP House incumbent, held onto one of their open seats, and almost snatched a strongly GOP-leaning open congressional seat.
"A party would almost always have incumbents run for reelection rather than open seats, especially in swing states, " said Quinn McCord, the executive editor of the Hotline.
In the House, Republicans expect to recapture Democratic open seats in Pennsylvania, New York and Virginia, and have high hopes for two others, in Missouri and Michigan.
Republicans will be competitive in Democratic open seats in Iowa, Michigan and Montana if they recruit top-quality candidates like Rep. Mike Rogers, who's considering a run for Michigan's open seat.
But depending on the momentum from the state Supreme Court election, recall elections, Assembly open seats, and legal fights, there could easily be enough support to recall Walker by then.
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Second, the 1992 elections saw an unusually high number of open seats, and women are just as likely as men to be elected in an open race, Ms Hawkesworth says.
Three of the races went to incumbents who were relative short-timers -- two Republicans and one Democrat -- while two Democrats and one Republican picked up the other three, all open seats.
The last three election cycles produced the largest number of retirements in the last 40 years: in 1996 there were 50 open seats, in 1994 there were 48 and in 1992 there were 65.
While most of the Republican incumbents running Tuesday were expected to win re-election, a wave of retirements left the GOP with the task of defending nine open seats, where most of their losses were expected.
Open seats are more likely to flip, and so far only two Republicans are retiring (Georgia's Saxby Chambliss and Nebraska's Mike Johanns) while six Democrats are, including three in states handily carried by Mr. Romney (West Virginia, South Dakota and Montana).
Graham and three other Senate Democrats from the South -- John Edwards of North Carolina, Zell Miller of Georgia and Ernest Hollings of South Carolina -- have all decided to leave next year, forcing the party to defend four open seats in a region that's increasingly Republican.
So the airline decided last year to manage availability differently to open up seats closer to when customers actually book.
Meanwhile, the entire case devolved into a circus-like spectacle attracting dozens of enthusiast each day to the courthouse as they lined up for a chance to score just a few open public seats in the gallery.
Democrats, who trail in the race for the open Democratic seat in Nevada, need to hold the open Democratic seats in New Jersey, New York and Nebraska, and hope for a come-from-behind victory by Virginia Democrat Charles Robb, to have any chance of recapturing the Senate.
This is a large private lounge very centrally located on the second floor within the clubhouse, so you can watch races in the traditional fashion, from good open air box seats, then come in as often as you want between races for an air conditioned venue with open bar, free flowing food, live music, large screen and private betting terminals.
They keep half of their seats open for walk-ins, but even so there is often an hour wait -- just the right amount of time to have a few apertifs and spark mischief.
It's not as glamorous as open elections for board seats, but it's a lot cheaper.
Six Republican seats and five Democratic seats are open this year.
Summer Smith Hull, who blogs about frequent-flier miles for families, checks over and over for seat assignments if she doesn't get them right away, grabbing seats that open up when travelers cancel or get upgraded to first class.
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By the time Ian Humphreys replied in kind for Ulster, even the guests in the new hospitality boxes had deserted their indoor video screens and taken seats in the open air, reluctant to miss any of the action and sensing that something special was about to unfold.
The center armrest between the front seats, which swings open to reveal a storage bin, is one smooth piece of leather devoid of unsightly shut lines.
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