CQ Politics is changing its rating from "Leans Republican" to "No Clear Favorite" in the Oregon race between two-term Republican Gordon Smith and Democratic challenger Jeff Merkley, the speaker of the state House.

Here are today's updated polls of Senate races:

• Colorado: Udall 54, Schaffer 40. (Quinnipiac/WSJ/Washington Post); Udall 45, Schaffer 34 (Suffolk University)
• Minnesota: Franken 39, Coleman 37, Barkley 17. (Quinnipiac/WSJ/Washington Post)
• North Carolina: Hagan 46, Dole 44, Cole 5. (Public Policy Polling)
• Oregon: Merkley 46, Smith 41. (SurveyUSA)

To keep up with our race ratings, you can also go to our Senate Races to Watch page.

Here are the states we're updating today in our round-up of general election match-ups between John McCain and Barack Obama:

• Colorado: Obama 52, McCain 43. (Quinnipiac/WSJ/Washington Post); Obama 47, McCain 43. (Suffolk University)
• Florida: Obama 51, McCain 46. (Fox News/Rasmussen)
• Michigan: Obama 54, McCain 38. (Quinnipiac/WSJ/Washington Post)
• Minnesota: Obama 51, McCain 40. (Quinnipiac/WSJ/Washington Post)
• Missouri: Obama 50, McCain 47. (Fox/Rasmussen); Obama 48, McCain 46. (Public Policy Polling)
• North Carolina: Obama 49, McCain 46. (Public Policy Polling); Obama 48, McCain 48. (Rasmussen)
• Ohio: Obama 49, McCain 47. (Fox/Rasmussen); Obama 50, McCain 45. (SurveyUSA)
• Pennsylvania: Obama 51, McCain 38 (Muhlenberg); Obama 55, McCain 40. (SurveyUSA)
• Wisconsin: Obama 54, McCain 37. (Quinnipiac/WSJ/Washington Post)
• Virginia: Obama 50, McCain 47. (Fox/Rasmussen)

Also, check out CQ Politics Presidential election maps which give you four different ways to look at the race, including one that lets you build your own electoral scenario.

Quinnipiac University has released its latest swing state polls showing Florida and Ohio as too close to call, and Barack Obama still with a lead in Pennsylvania, but a smaller one than he enjoyed in June. One theme running through the three states were voter concerns about energy costs which are clearly eclipsing foreign issues, including Iraq. Quinnipiac said that voters in all three states by margins of 27 to 30 points favored more offshore drilling, a position which John McCain has advocated and Obama opposes.

We're updating our round-up with polls from New Mexico and Maine, although the Maine poll we added was reported this week but actually conducted in June.

• New Mexico: Democrats appear headed for a pick-up here with Rep. Tom Udall running ahead of Rep. Steven Pearce (60-36 percent) for the seat held by retiring GOP Sen. Pete V. Domenici. Udall leads 59 percent to 34 percent in a Rasmussen Reports poll conducted July 24. Udall enjoys a 66 percent favorable rating compared to 46 percent for Pearce. Domenici had held this seat since 1973.

We're updating the round-up of John McCain vs. Barack Obama match-ups for the swing state polls released yesterday by Quinnipiac University/Washington Post/Wall Street Journal, including Colorado, Michigan, Minnesota and Wisconsin. We also update New Mexico and Pennsylvania.

• Colorado: McCain is leading Obama 46 percent to 44 percent with 7 percent undecided and a 2.6 percent margin of error in a Quinnipiac University/Washington/Post poll conducted July 14-22. Obama led by 5 points in this poll last month. Big gender gap here with Obama having an 11 point edge among women and McCain leading by 18 points among men. This is one of the states where Hispanics are a key voting bloc and Obama leads by 28 points. A Rasmussen Reports survey conducted July 21 had Obama is leading McCain 49 percent to 42 percent. The margin of error was 4.5 percent. However, the contest falls within the margin of error if "leaners" are included. Last month, Obama led by 2 points. Obama's favorable-to-unfavorable numbers are 52 percent to 48 percent and McCain's are 61 percent to 39 percent. In most states where Rasmussen has asked the question so far, voters care more about bringing down the price of gasoline than protecting the environment, but in Colorado they split about evenly. But like voters in other states, they see Afghanistan rather than Iraq as the main front in the war on terrorism and as the greatest threat to national security. A Public Policy Polling survey conducted July 9-10 by had Obama ahead of McCain 47 percent to 43 percent with 10 percent undecided and a 3 point margin of error. This is one of the states, along with Florida, Nevada and New Mexico, where Hispanics may be an important force. They make up 15 percent of the sample in the PPP poll and Obama leads among them 58 percent to 34 percent while running evenly with McCain among white voters. The state has gone Republican the last three elections (by less than 5 points in 2004), but the Obama camp thinks they can make it competitive.

John McCain has closed the gap with Barack Obama in the key swing states of Colorado, Michigan, Minnesota and Wisconsin, according to a Quinnipiac University/Washington Post/Wall Street Journal survey conducted July 14-22. (You can find the Quinnipiac numbers here and an easy-to-scan Washington Post interactive graphic here).

The summary:

• Colorado: McCain leads 46 percent to 44 percent with the margin of error at 2.6 percent. Obama lead by 5 points in late June. The state has gone Republican the last three elections, though by less than 5 points in 2004.
• Michigan: Obama still leads here, by 46 percent to 42 percent with a 2.4 percent margin of error. That's down two points from the last poll. Michigan has gone Democrat in the last five elections with the only Republican to win being the first George Bush in 1988.
• Minnesota: Obama is ahead 46 percent to 44 percent with a 2.8 percent margin of error. His previous lead was 17 points. Democrats have won the last five elections here, but the margin in 2004 and 2000 was 3.5 percent or less.
• Wisconsin: Obama leads 50 percent to 39 percent with a 3 percent margin of error. That's also down two points since the last poll. Democrats have carried the state in the last five elections, but by less than one point in 2004 and 2000.