Here are updates from yesterday and today in our match-ups between John McCain and Barack Obama:

• Arizona: McCain 49, Obama 41. (Northern Arizona University)
• Arkansas: McCain 54, Obama 44. (Rasmussen)
• California: Obama 61, McCain 34. (Rasmussen)
• Colorado: Obama 50, McCain 46. (Rasmussen)
• Florida: Obama 50, McCain 43. (Los Angeles Times/Bloomberg); Obama 49, McCain 44. (Suffolk); Obama 47.2, McCain 46.9. (Zogby); Obama 51, McCain 47. (Rasmussen)
• Indiana: McCain 50.2, Obama 44. (Zogby)
• Iowa: Obama 52, McCain 42. (Marist)
• Louisiana: McCain 50.6, Obama 38.3. (Southeastern Louisiana University)
• Mississippi: McCain 53, Obama 45. (Rasmussen)
• Missouri: Obama 48.2, McCain 45.7. (Zogby); Obama 48, McCain 47. (Rasmussen)
• Montana: McCain 48, Obama 44. (NBC/Mason-Dixon)
• Nevada: Obama 48.2, McCain 44. (Zogby)
• New Hampshire: Obama 50, McCain 45. (Marist); Obama 55, McCain 39. (WMUR/UNH); Obama 50, McCain 39. (NBC/Mason-Dixon)
• New Jersey: Obama 53, McCain 38. (Strategic Vision)
• Nevada: Obama 50, McCain 46. (Rasmussen)
• North Carolina: Obama 49, McCain 48, Barr 1. (Public Policy Polling); Obama 49.7, McCain 46.4. (Zogby); McCain 49, Obama 48. (Rasmussen); Obama 47, McCain 47. (NBC/Mason-Dixon)
• Ohio: Obama 49, McCain 40. (Los Angeles Times/Bloomberg); Obama 49.7, McCain 45.1 (Zogby); Obama 49, McCain 45. (Rasmussen); Obama 49, McCain 45. (SurveyUSA)
• Oregon: Obama 57, McCain 38. (SurveyUSA)
• Pennsylvania: Obama 50, McCain 41. (Temple); Obama 53, McCain 46. (Rasmussen)
• Vermont: Obama 57, McCain 36. (Research 2000)
• Virginia: Obama 53, McCain 44. (Washington Post/ABC News); Obama 52, McCain 43. (SurveyUSA); Obama 52, McCain 44.8. (Zogby); Obama 51, McCain 47. (Rasmussen)
• Washington State: Obama 55, McCain 34. (University of Washington)
• Wisconsin: Obama 50, McCain 41. (Strategic Vision)
• West Virginia: McCain 50.3, Obama 40.4. (Zogby)

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.

Three national polls are out today with different pictures of the race, although none of them are particularly good news for Barack Obama. There has also been a series of state polls in the last two days which showed the Democrat having difficulty gaining any ground.

The George Washington University Battleground 2008 survey conducted Aug. 10-14 has John McCain in a dead heat with Obama leading him 47 percent to 46 percent with 2 percent preferring "other" and 19 percent undecided. The poll is conducted jointly by the Republican Tarrance Group and the Democratic firm of Lake Research Partners.

A Wall Street Journal/NBC News survey conducted Aug. 15-18 says McCain now trails Obama by only 45 percent to 42 percent in, down from the 6 point leads Obama held in June and July. Four percent answered "neither" and 8 percent were undecided. The margin of error is 3.1 percent.

And a Reuters/Zogby poll conducted Aug. 14-17 has McCain moving out front 46 percent to 41 percent with 13 percent undecided. The margin of error is 3 points. Last month, Obama had led by 7 points.

These three polls come on the heels of yesterday's Los Angeles Times/Bloomberg survey that had Obama and McCain in a statistical tie, with Obama ahead 45 percent to 43 percent in a survey conducted Aug. 15-18. The margin of error was 3 points.

When you combine these with match-ups of McCain and Obama in eight competitive states for which polls came out yesterday and today, a picture emerges of an Obama campaign - at least at this point - losing some of the luster it had after he clinched the nomination, and either just holding his ground or slipping in the polls.