AUSTIN, Texas (CBSDFW.COM) – With 70% of precincts reporting, Air Force veteran Mary “MJ” Hegar leads longtime State Senator Royce West in the U.S. Senate Democratic Primary runoff election 52% to 48%.

This is Hegar’s second attempt at public office.

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West, a Dallas attorney, was first elected to the Texas Senate in 1992.

Hegar won the primary election 22% to 14% for West in a 12-person race.

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The winner of this runoff takes on incumbent Republican Senator John Cornyn.

Sen. Cornyn has held the office since 2002.

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Democratic Primary Runoff Between MJ Hegar And Royce West For US Senate Becomes More Bitter