Specific examples of Democrats he has prosecuted please? I keep hearing this claim, I have yet to see any credible evidence to back it up. Source please?
In 1992, Texas House Speaker Gib Lewis, D-Fort Worth, pleaded no contest to a misdemeanor ethics charge and was fined $2,000 as part of a plea bargain.
In 1985, Attorney General Jim Mattox, a Democrat, was acquitted of a felony bribery charge brought by Mr. Earle's office.
In 1978, Mr. Earle obtained a felony perjury conviction of state Supreme Court Justice Don Yarbrough, a Democrat.
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This list came from http://www.tpj.org/page_view.jsp?pageid=763&pubid=521, but with the help of google you can find plenty of corroboration for the veracity of these..