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When only 3 states out of 50 (Alaska, Connecticut, and California) get marks other than D or F, I get suspicious of the results.
I found another website that goes into more detail, and is probably more relevant.
Per capita, Louisiana is the more corrupt state, a situation that likely hasn't changed much since the demise of Huey Long 80 years ago.
In terms of the absolute number of pubic officials convicted, California is ranked 2nd worst, in spite of the "C" rating in the poll that you posted.
If you look at the Public Integrity website from last year, you'll notice that there are some marked differences from the results that they got this year:
The conclusion that I would draw from this exercise is that public opinion polls are useful, but always take them with a grain of salt.