HOUSTON – There are hundreds of races being decided by Houston-area voters on Election Day. Here are the five biggest races to watch. Senator View All CandidatesU.S. House District 2Republican and freshman congressman Dan Crenshaw is up for reelection this cycle. U.S. Representative, District 2 View All CandidatesU.S. House District 7Democratic U.S. Rep. Lizzie Fletcher is also a first-term member of Congress who is up for reelection this time around. U.S. Representative, District 7 View All CandidatesU.S. House District 22This seat is wide open after Republican U.S. Rep. Pete Olson announced he is retiring.