Gallup's tracking poll shows Romney dropped one point in the polls following the convention, while Barack Obama went up one.
The only other presidential candidates to not get a bounce post convention were George McGovern in 1972 and John Kerry in 2004.
The Republican National Convention this year failed to generate a lot of excitement among voters nationwide. It is not clear if that is a reflection of the Republicans' presentation, their nominee himself, or the fact that it came just before the Labor Day holiday. In any case, the net result is that Romney is no better positioned in the 2012 election after the convention than he was before it.