Where things stand in Texas ahead of the primary

President Trump heads to Texas today amid final campaigning in two of the country's most closely watched electoral contests before midterm primaries in the Lone Star State next week.

Texas's elections kick off a series of primaries throughout the country over the next six months, and the marquee Senate battle is capturing the political spotlight.

The race has already set a record as the most expensive Senate primary in U.S. history, with $110 million spent in campaign advertising. Most of that spending has been on the GOP side.

Polling shows a close race among the three Republican candidates, with Texas Attorney General Ken Paxton holding a slight lead in the Decision Desk HQ (DDHQ) polling average, an advantage he's held for months over incumbent Sen. John Cornyn (R). Paxton is narrowly ahead in the average with 36.5 percent support, closely followed by Cornyn with 32.2 percent and Rep. Wesley Hunt (R) in third with 18 percent.