 <translate> The question Passage: The 2018 Texas gubernatorial election will take place on November 6, 2018, to elect the Governor of Texas, concurrently with the election of Texas's Class I U.S. Senate seat, as well as other congressional, state and local elections throughout the United States and Texas. Incumbent Republican Governor Greg Abbott is running for re-election to a second term in office and will face Democrat Lupe Valdez, the former Sheriff of Dallas County, as well as Libertarian Mark Tippetts, a former member of the Lago Vista city council.

Question: Based on this passage, who are the democrats running for governor of texas? <yor> Ìbéèrè: Ìdìbò gómìnà ìpínlẹ̀ Texas ti ọdún 2018 yóò wáyé ní ọjọ́ kẹfà oṣù kọkànlá ọdún 2018, láti yan Gómìnà ìpínlẹ̀ Texas, lẹ́ẹ̀kan náà pẹ̀lú ìdìbò fún ìjókòó Sẹ́netì ní Texas, àti àwọn ìdìbò àpapọ̀, ìpínlẹ̀ àti ìdìbò àdúgbò ní gbogbo orílẹ̀-èdè Amẹ́ríkà àti Texas. Gómìnà olóṣèlú Republican Greg Abbott ti ń díje fún ìdìbò fún sáà kejì ní ọ́fíìsì, yóò sì dojú kọ ọmọ ẹgbẹ́ òṣèlú Democrat Lupe Valdez, tí ó jẹ́ ọ̀jọ̀gbọ́n Sheriff ti Dallas County, àti ọmọ ẹgbẹ́ òṣèlú Libertarian Mark Tippetts, tí ó jẹ́ ọ̀jọ̀gbọ́n ọmọ ẹgbẹ́ ìlú Lago Vista.  Ìbéèrè: Ní ìbámu pẹ̀lú àyọkà yìí, àwọn wo ni àwọn ọmọ ẹgbẹ́ òṣèlú-òṣèlú tí wọ́n ń díje fún ipò gómìnà Texas? 