PDiddie's main reason for not supporting Democrat James Cargas, in the absence of a Green candidate in that race, is reducible to one word: fracking. Cargas, an energy attorney, is a founder of Texas Oilpatch Democrats.
The Houston Chronicle actually endorsed Democrat Cargas in TX-7. This is Cargas's third attempt at knocking off incumbent John Culberson, the heir in that district to the redoubtable Bill Archer. Culberson is the only local incumbent Congressperson not to receive the Chron's endorsement. A list of the paper's other endorsements can be found here (digital subscription may be required). The Chron seems to have omitted TX-36 from their consideration—but then, I've been known to forget about 36 myself.
By tradition, the Chronicle's editorial board is moderately conservative, but more interested in fostering good government than in drowning government in a bathtub. Last week the editorial board spilt a lot of ink explaining, in five languages, its endorsement of Hillary Clinton, a far more conservative position than endorsing billionaire loose cannon and serial groper Donald J. Trump. In a noteworthy endorsement last month, the Chronicle also recommended Libertarian Mark Miller for the Railroad Commission.
The Houston LGBT Political Caucus has its list up as well. As usual, it is heavily Democratic. If the Harris County Green Party wants a nod from the Caucus, it will need to educate future Green candidates about the Caucus's policy of not endorsing any candidate who does not apply for the endorsement. I made the mistake of forgetting that in 2014. In fact many political organizations have a similar policy: Having a candidate say publicly, "Sorry, but I don't really want the endorsement you just gave me" can be acutely embarrassing.