SANANTONIO -- There is a building full of potential Republican gubernatorial candidates now that Rick Perry has announced he will not seek another term. First on that list, and probably the early front-runner, would be Attorney General Gregg Abbott.

Perry is by far the longest-serving governor in Texas history and the longest-sitting governor in the United States. He took office in 2000 when George W. Bush left for the White House.

Perry had earlier announced that through an agreement, Abbott would not run for governor if Perry did seek another term.

There are a couple of other potential candidates that deserve mention as well. Lt. Gov. David Dewhurst has been in the No. 2 chair since 2003 and definitely has higher political aspirations. He is coming off a bruising defeat at the hands of Ted Cruz, who beat him in the race for retiring U. S. Senator Kay Bailey Hutchison's seat -- which brings up another potential candidate.

Hutchison retired after announcing she would run against Perry in the 2010 primary. After leaving the Senate, Hutchison announced she was retiring from political life. We'll see what happens.

As for Democrats, state Sen. Wendy Davis has to be the party's front-runner. She won her Senate seat in 2008, then won re-election in 2012 -- beating out House Republican member Mark Shelton. Davis recently pulled off a huge victory for Democrats when she successfully filibustered, for 10 hours, a bill which would place tighter restrictions on Texas abortion clinics.

There is also a potential dark horse candidate for Democrats -- one who has received a lot of attention lately -- San Antonio Mayor Julian Castro. His spokesman said the only comment Castro was making right now is whatever he is tweeting.

None of the Republicans mentioned here would comment for this piece.

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