Senate District 21 is a Laredo-based seat that, thanks to Republican redistricting, goes all the way to Travis County/Austin. Democrat Judith Zaffirini has represented the district since 1987 and she's the 2nd most senior senator and the first Hispanic woman elected to the State Senate.
Obama - 58.4%; 116,117
Romney - 39.8%; 79,167
Sadler - 54.3%; 104,747
Cruz - 41.5%; 80,022
She's behind Democrat John Whitmire in terms of seniority, but she equals him in another.
Delaware most closely matched SD 21 (and previously SD 15). Obama won Delaware by 18.63% and carried this district by 18.6%. Sadler won here by 12.8%.