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DENVER — On the eve of the GOP primary that will determine his opponent, Democratic Gov. John Hickenlooper’s campaign spent $469,600 to reserve more TV air time for the fall.

Following it’s initial $906,000 buy last month, the campaign has now reserved nearly $1.4 million in TV time to run ads this fall.

The initial buy secured time for the final month of the election, from October 7 through Election Day, November 3.

This week’s buy extends the Hickenlooper fall ad blitz back into September, securing air time from Sept. 21 through Oct. 7 — and doing so before ad rates rise amidst an expected surge in campaign spending related to Colorado’s top tier U.S. Senate race and a series of local control initiatives around oil and gas development that appear headed for the November ballot.

“We continue to receive strong support from folks across Colorado, and we’re going to put it to good use,” said Hickenlooper for Colorado campaign manager Brad Komar. “Colorado’s economy continues to improve, and this ad buy will help us get the word out in a positive way.”

While the Republican contenders have struggled to raise money, Hickenlooper has amassed a significant war chest for this fall’s reelection bid and is nearing the $3 million mark in total contributions.

As of last week, the campaign had $932,000 cash on hand.