http://www.msnbc.msn.com/id/14721449/Other parts of the article are worth a read in addition to the excerpts.
Excerpts:
Pennsylvania : The contest between Rick Santorum (R) and Bob Casey (D) -- which consistently clings to the top spot in Chuck Todd's race rankings -- just keeps heating up underneath the national spotlight. Gallup found Casey ahead of the vulnerable incumbent by double digits among both registered voters (14 percent) and likely voters (18 percent).*
Montana : Chuck Todd's No. 2 race was the closest of the five, with results well within the poll's margin of error. Forty-eight percent of likely voters said they would choose John Tester (D) over incumbent Sen. Conrad Burns (R). Registered voters put Burns ever so slightly ahead, 44 percent to Tester's 42 percent.
Ohio : The Buckeye State's race looks tight as well. Incumbent Sen. Mike DeWine (R) trailed his challenger, Sherrod Brown (D), by 6 points among likely voters but just 2 points among registered voters.
Missouri : This race is the only one Gallup tested that showed the Republican hopeful coming out significantly ahead -- at least among one group. Jim Talent led Democrat Claire McCaskill by 6 points among likely voters. Among registered voters, however, the opponents tied at 41 percent each.
Minnesota : A second competitive race shows a Democratic candidate, Amy Klobuchar, solidly ahead of the GOP candidate, although she doesn't enjoy a lead as big as Casey's. Half of Gallup's likely voters said they planned to vote for the Hennepin County attorney; 40 percent said they would vote for her opponent, Rep. Mark Kennedy (R). The split was 3 points narrower among registered voters.