Here is a summary of the results in each race polled:
CONNECTICUT - Sen. Joseph Lieberman, running as an independent, has a 49 percent to 37 percent lead on Democratic anti-war challenger Ned Lamont, down from a 20-point lead in early October. Lieberman, a three-term Democratic incumbent, lost the party primary in August after Lamont attacked his support for the Iraq war.
MARYLAND - Democratic Rep. Ben Cardin leads Republican Lt. Gov. Michael Steele by 49 percent to 44 percent in the race to replace retiring Democratic Sen. Paul Sarbanes. Cardin led by 8 points in early October.
MISSOURI - Democratic state Auditor Claire McCaskill took a 46 percent to 43 percent lead over Republican Sen. Jim Talent, who had a 4-point lead in early October. The see-sawing contest has been close all year, with neither candidate opening a significant advantage.
MONTANA - Democrat Jon Tester holds a 47 percent to 46 percent lead over fast-closing Republican Sen. Conrad Burns, down from a 4-point lead in early October. Burns is fighting back from a series of problems, including links to convicted lobbyist Jack Abramoff and comments seen as insensitive to some ethnic groups.
NEW JERSEY - Democratic Sen. Robert Menendez, considered vulnerable after polls showed a tightening race, leads Republican challenger Tom Kean by 49 percent to 37 percent. That is up slightly from his 10-point lead in early October.
OHIO - Democratic Rep. Sherrod Brown leads Republican Sen. Mike DeWine by 49 percent to 42 percent. The two were in a dead heat at 41 percent in early October.
PENNSYLVANIA - Democrat Bob Casey, the son of a popular former governor, leads third-ranking Senate Republican Rick Santorum by 48 percent to 40 percent. Casey led by 12 points in early October.
RHODE ISLAND - Sen. Lincoln Chafee, a moderate Republican in one of the most Democratic states, trails Democratic challenger Sheldon Whitehouse by 53 percent to 39 percent. Whitehouse led by 4 points in early October.
TENNESSEE - In a bitter race for the open seat of retiring Senate Republican Leader Bill Frist, Republican Bob Corker, the former mayor of Chattanooga, opened up a 53 percent to 43 percent lead on Democratic Rep. Harold Ford. The two were tied in early October.
VIRGINIA - Democratic challenger James Webb holds a slim 45 percent to 44 percent lead over Republican Sen. George Allen, who led by 11 points in the last survey. Allen has suffered a series of campaign missteps.
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