Mitt Romney, who has been the presumptive nominee for weeks, may officially clinch the nomination tonight. Texas’s primary is tonight and has 155 delegates, most of which Mitt Romney will take. By most estimates Mitt Romney needs around 78 delegates to officially clinch the nomination. This usually celebratory time means nothing for Mitt Romney who has been the presumptive nominee and he will be in Las Vegas with Donald Trump and Newt Gingrich.