SWACgirl notes the MSNBC poll on President Obama's performance. The link goes to the same page as the poll I noted in mid-March. When it was first publicized, it was 40 percent A and 40 percent F. The lefties noticed that, and moved the grade to 51 percent A and 30 percent F the next day.
I guess the left forgot about it after that, but the right didn't. Right now, it's 30 percent A and 44 percent F.
The poll may not be scientific, but the roller-coaster ride demands study.