MSNBC Predicts Republicans Hold Senate

Here's the state by state rundown:

In Pennsylvania, incumbent Republican Sen. Rick Santorum is still well behind his Democratic challenger Bob Casey, with Casey currently ahead by 13 percentage points, 52 percent to 39 percent, with 7 percent undecided. In an MSNBC/McClatchy poll conducted two weeks ago, Casey was up by 12 percentage points.

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In Rhode Island, incumbent Republican Sen. Lincoln Chafee has closed the gap with Democrat Sheldon Whitehouse. Chafee is now supported by 46 percent of likely voters compared to Whitehouse’s 45 percent. There are 9 percent undecided. Two weeks ago, Whitehouse was leading by 5 percentage points.

In Missouri, Democrat Claire McCaskill and incumbent Republican Sen. Jim Talent remain virtually tied with McCaskill supported by 46 percent of likely voters and Talent supported by 45 percent with 7 percent undecided. Late last month, McCaskill had 46 percent to Talent’s 43 percent.

In New Jersey, incumbent Democratic Sen. Bob Menendez has widened his advantage over Republican challenger Tom Kean Jr., holding 48 percent of likely voters compared with 41 percent supporting Kean. There are still 8 percent undecided. In late October, the candidates were in a virtual tie (45 percent for Menendez to 42 percent for Kean). In a race in which both candidates have been criticized for using negative attack ads, 54 percent of voters think both have attacked each other unfairly.

In Washington, incumbent Democratic Sen. Maria Cantwell has maintained her sizeable lead over Republican challenger Mike McGavick. She now leads by 16 percentage points, 54 percent to 38 percent, with 7 percent undecided. Last month she led by 15 percentage points (52 percent to 37 percent).

In Michigan, Democratic incumbent Debbie Stabenow is comfortably ahead of her Republican opponent, Michael Bouchard (53 percent-37 percent). There are 7 percent undecided.

In Arizona, Republican incumbent Jon Kyl is ahead of his Democratic opponent Jim Pederson (49 percent-41 percent). There are 7 percent still undecided.

In Maryland, Democrat Ben Cardin and his Republican opponent, Michael Steele are virtually tied (47 percent-44 percent). There are 9 percent undecided.

In other Mason-Dixon polls:

In Ohio, a Cleveland Plain Dealer poll shows Democratic challenger Rep. Sherrod Brown still leading incumbent Republican Sen. Mike DeWine, 50 percent to 44 percent. There are 5 percent undecided in this race. Last month, Brown was up by 8 percentage points (48 percent-40 percent).

In Montana, a Lee Newspapers poll shows incumbent Republican Sen. Conrad Burns is tied with Democratic challenger Jon Tester, with each holding 47 percent. Five percent are undecided. Last month, Tester had 46 percent and Burns 43 percent.

In Tennessee, a Chattanooga Times Free Press & Memphis Commercial Appeal poll shows Republican Bob Corker holding a 12-percentage point lead over Democrat Rep. Harold Ford Jr., 50 percent-38 percent. Nine percent still undecided. In late October our poll showed Ford with 45 percent and Corker with 43 percent.

In Virginia, a Mason-Dixon Virginia Poll shows Democratic challenger Jim Webb has moved into a virtual tie (46 percent-45 percent) with Republican Sen. George Allen. Seven percent are undecided. The previous poll showed Allen with 47 percent and Webb with 43 percent.