. >> reporter: just who does texas state senator sylvia garcia represent?ly the senior citizens gathered for this health fair. the pride at how far the community has come in the united states is evident. >> the first full-time hispanic every elected here. >> reporter: some 70% of the constituents are hispanic. part of an emerging block. now the supreme court has agreed to hear a case that could dilute that minority vote just as it was emerging as a powerful force. >> you would see a shift of pow power back to rural areas. >> reporter: in the u.s. each political district has roughly the same population. in some latino political districts a large percentage of that population is not eligible to vote. they are too young or aren't citizens. that's not the case in majority white areas. so the plaintiffs argue this contravenes the principal of one person, one vote. the plaintiffs the texas republican party and the million dollars right-wing sponsor of the case declined to be interviewed. but sylvia garcia says she knows what is going on. >> this is from the folks

. >> reporter: just who does texas state senator sylvia garcia represent? clearly the senior citizens gathered for the texas hispanic council health fair. spanish may be the primary language here, but the pride at how far the community has come in the united states is evident. >> the first full-time hispanic ever elected in harris county. >> reporter: some 70% of garcia's constituents are hispanic, part of an emerging political bloc that the republican party agonizes over. minorities tend to stroet for democrats. now the supreme court agrees to hear a case to die lute that minority vote as it was emerging as a powerful force. >> you see a shift of power away from places where you have lots of immigrants and children back to rural areas. >> reporter: the plaintiff's argument is this. in the u.s. each political district has roughly the same population. in some latino political districts like senator garcia's, a large percentage of that population is not eligible to vote. they're too young or aren't citizens. that's not the case in majority white areas. so the