bad kerning

Hi,
Can you guys educate me about some general rules to be followed while kerning Helvetica. And can you point out the shortcomings in terms of kerning in the piece below and suggest any improvements. It looks alright to me but you guys are better at this. I really want some help with kerning lowercase "r" and "t".

Thanks, I really appreciate the help.

From MSNBC today.

It was a perfect storm of bad kerning.

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