Dic: plead for/to/with (someone or something)

plead for someone: to beg for someone to be spared.

• Tom pleaded for Dave, but it was no use. Dave was found guilty. 
• She pleaded for her husband, but the judge sentenced him to ten years in prison.

plead for something: to beg for something.

• I don't want to have to plead for what's already mine. 
• The children were pleading for ice cream, so we got some for them.

plead with someone: to beg something of someone; to make an emotional appeal to someone.

• Do I have to plead with you to get you to do it? 
• You can plead with me as much as you want. I won't permit you to go.

plead guilty to something: to state that one is guilty of a crime before a court of law.

• Gerald refused to plead guilty to the crime and had to stand trial. 
• Max pleaded guilty to the charge and then fled town.

plead to something: to enter an admission of guilt to a specific crime.

• Max pleaded to the lesser charge of larceny. 

... McGraw-Hill Dictionary of American Idioms and Phrasal Verbs,

http://idioms.thefreedictionary.com/plead