Quinnipiac University is out with the latest in a series of polls it's conducting on the presidential race in potential battleground states. Like most of the polls that Quinnipiac released a week ago, this newest set shows Barack Obama leading John McCain, if not by much in some cases, but slipping.

Last week, the states polled were Colorado, Michigan, Minnesota and Wisconsin. This week it's three more potentially key states: Florida, Ohio and Pennsylvania. In Florida and Ohio, Obama leads McCain 46-44. In both cases, that lead falls within the margin of error, meaning the two candidates are essentially tied. In Pennsylvania, the news is better for Obama -- he's in front of McCain 49-42, which is a statistically significant lead.

In all three states, Quinnipiac found, Obama has been losing ground to McCain. In Florida, Obama has lost just 1 percentage point since June, but in Ohio his lead has gone from 6 points to just 2 and in Pennsylvania his lead went from 12 points to 7. This latest set of polls was conducted between July 23 and July 29.

As always, remember that the election is still relatively far away and that these numbers may not ultimately be a very good predictor of the results come November. For the moment, the most that can be said is that they're an interesting snapshot in time.