Allies of Sen. John Cornyn (R-TX) are unleashing millions of dollars in ad money for radio and TV, an influx that appears to have helped shrink state Attorney General Ken Paxton’s once commanding lead in their bitter Texas GOP Senate primary.

More than $5 million has been pumped into advertising on the airwaves in recent months, with reservations that run through August by political groups supporting Cornyn, according to ad spending data provided by a media buyer monitoring the race.

That figure could explode once the campaigns get directly involved ahead of next year’s primary, with candidates receiving cheaper ad rates and both sitting on millions in their campaign coffers.

Most reservations have been in Texas media markets, but a handful have also included New York, Washington, D

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