The jury instruction on that is very clear and it's what I go by. I'm not sure why I would have to rephrase it in my own words, since I understand the instruction very well, but I can do that very briefly:
If I can't vote 'guilty' and walk away from this case knowing that I have made the right decision based on the evidence, I have reasonable doubt. If I will look back and still not be sure, then I have reasonable doubt. If I go back and forth about the defendant's guilt, thinking one minute that she's guilty and the next that she's not, I have reasonable doubt.
The actual instruction:
Whenever the words "reasonable doubt" are used you must consider the following:
A reasonable doubt is not a mere possible doubt, a speculative, imaginary or forced doubt.Such a doubt must not influence you to return a verdict of not guilty if you have an abiding convictionof guilt. On the other hand, if, after carefully considering, comparing and weighing all the evidence,there is not an abiding conviction of guilt, or, if, having a conviction, it is one which is not stable butone which wavers and vacillates, then the charge is not proved beyond every reasonable doubt andyou must find the defendant not guilty because the doubt is reasonable.
It is to the evidence introduced in this trial, and to it alone, that you are to look for that proof.
A reasonable doubt as to the guilt of the defendant may arise from the evidence, conflict inthe evidence or the lack of evidence.
If you have a reasonable doubt, you should find the defendant not guilty. If you have noreasonable doubt, you should find the defendant guilty.
http://www.scribd.com/doc/59297005/Jury-Instructions-Casey-Anthony
Thanks for the link. I checked it out, but I don't like to use blogs when I'm following a case.
I'm not sure if you're asking whether *I'm* saying that the jury dismissed the evidence because Baez was more likeable, but in case you are... No. What I'm saying is that a jury is often more likely to grasp what an attorney is presenting and more likely to find them credible based on the attorney's demeanor.