With all of his rivals either out of the race or not campaigning in the state, it looks as if Romney will indeed pass that mark in Texas. However, Texas Representative Ron Paul remains on the ballot and has a strong following in his home state, potentially creating a minor roadblock for Romney's eventual nomination.
Meanwhile, a separate contest will determine the Republican candidate for an upcoming Senate race. The two major contenders are David Dewhurst, Texas' lieutenant governor and Ted Cruz, former solicitor general. If no candidate wins Tuesday's primary with a majority, it will go to a runoff election between the pair with the most votes.
President Obama is also facing a primary challenge from multiple candidates, including a Tennessee lawyer who got 42% of the vote in the Arkansas primary -- but it's not likely he'll beat Obama in the Lone Star state.
Throughout the night, politicians, journalists and voters will use social media to rally support, tell the story of the Texas primary and discuss the night’s events. Follow along as Mashable collects the best examples of social media use throughout primary night in Texas:
[View the story "Follow the Texas Primary on Social Media" on Storify]