Romney's polls, compared with other historical challengers

From The Washington Times via Instapundit:

According to the latest Gallup survey, Mitt Romney is polling 52% of likely voters. At this point in the race he is ahead of: 

Where Jimmy Carter was in 1976 (47%) 

Where Ronald Reagan was in 1980 (39% -- Carter was six points up) 

Where George H.W. Bush was in 1988 (50%) 

Where Bill Clinton was in 1992 (40%) 

Where George W. Bush was in 2000 (48%) 

Where Barack Obama was in 2008 (49%)

:)