| | In the Republican primary held on March 6, 2018, Cruz defeated four weak intra-party opponents with 1,317,450 votes (85.3 percent). In the Democratic primary, O'Rourke received 641,337 votes (61.8 percent) over two intra-party rivals. Some 506,000 more Republicans voted in the Texas primary than did Democrats.<ref>{{cite web|url=https://enrpages.sos.state.tx.us/public/mar06_325_state.htm?x=0&y=1394&id=142|title=Election Returns|date=March 6, 2018|publisher=Texas Secretary of State|accessdate=March 9, 2018}}</ref> | | In the Republican primary held on March 6, 2018, Cruz defeated four weak intra-party opponents with 1,317,450 votes (85.3 percent). In the Democratic primary, O'Rourke received 641,337 votes (61.8 percent) over two intra-party rivals. Some 506,000 more Republicans voted in the Texas primary than did Democrats.<ref>{{cite web|url=https://enrpages.sos.state.tx.us/public/mar06_325_state.htm?x=0&y=1394&id=142|title=Election Returns|date=March 6, 2018|publisher=Texas Secretary of State|accessdate=March 9, 2018}}</ref> |