Former Massachusetts Gov. Mitt Romney may have had the best performance on the debate stage in Arizona last night, but Thursday morning wasn't as great -- Romney dropped to 39 percent in Rasmussen's nightly tracking poll of a potential matchup between him and President Obama nationally. Obama got 49 percent, giving him a ten point lead. The Ras tracking numbers use 500 autodial interviews a night and average the results over three days.
As with any polling this cycle, the numbers have been extremely volatile. Romney was down only two points in the Rasmussen tracking data on Monday, and other polling has shown the race much closer.
Here's the TPM Poll Average of the matchup since the beignning of the year.