On Tuesday night, Republican Gov. Doug Ducey and Democratic challenger David Garcia met for the second time in two nights. The hour-long debate in Tucson included some heated exchanges between the candidates.

The economy in many parts of the state may not be booming. But Arizona Gov. Doug Ducey said Tuesday that voters — especially in southern Arizona — should give him another four years because it's a lot better than when he took office.

But in a head-to-head televised debate, Democrat David Garcia said Ducey cannot take credit for economic growth.

Southern Arizona issues took center stage Tuesday as the pair faced off for their second — and final —  debate in the studios of KUAT-TV, the Tucson PBS affiliate.

"I'm proud that Tucson is experiencing the fastest job growth that it's had in six years,'' Ducey said during the hour-long debate cosponsored by the Arizona Daily Star and KJZZ.

He specifically called out plans by companies like Caterpillar, Comcast and Amazon to expand in southern Arizona as proof that his record works.

Garcia disagree, saying that the whole country's economy is improving and that Tucson is lagging.

Job growth in Maricopa County has been at twice the rate of Pima County. And Cochise County lags even further behind.

"They're not growing to the extent the rest of the state is,'' Garcia said. "It's a lack of investment in K-12 education and a lack of a highly skilled workforce.''

But Ducey, who has crowed that Arizona is "open for business,'' found himself on the defensive when asked whether that means less regulation — and potential danger to Arizonans.

That specifically includes his decision to allow Uber to test its self-driving cars on Arizona roads without restrictions. That permission was withdrawn only after an Uber vehicle struck and killed a pedestrian.

Ducey was unapologetic, seeking to put that one death into perspective.

Howard Fischer/Capitol Media Services

Arizona Gov. Doug Ducey and David Garcia answer questions following a debate in Tucson on Sept. 25, 2018.

"We lose over 800 Arizonans a year on our highways due to human error from drivers,'' he said. "I wanted to open up the innovation for this technology for autonomous vehicles to come here.''

On other border issues, Ducey also made a strong case for plans by President Trump to expand the existing border wall.

"If we're going to have a wall that's going to stop drug cartels, human trafficking and child sex trafficking, I'm in favor of it,'' the governor said.

He said that just two-thirds of the border has a real physical barrier.

"And where these crimes are happening is where it's wide open and unprotected,'' Ducey said. "So a wall, a physical barrier and surveillance can keep our state safer and our country safer.''

"I am against Trump's wall,'' Garcia said, repeating his stance that when he said "Imagine no wall'' he did not mean removing existing barriers.

Instead, he said, the state should focus on the things that border sheriffs want, including patrolling the roadways of southern Arizona on a 24/7 basis as was originally promised by Gov. Ducey when he proposed and funded the Border Strike Force.

The pair found lots of other issues on which to disagree.

Ducey boasted of his school safety plan, a combination of taking guns from people who are determined to be a danger as well as additional armed police to serve as school resource officers.

The governor got no traction on the proposal, with the Republican-controlled Senate first diluting it before the package died in the House. But Ducey said it's still far preferable to what his opponent wants.

"He would remove school resource officers,'' the governor said.

"His plan is that actually kids should run for cover,'' Ducey continued. "I want to make sure that our schools are safe and that there's law enforcement available.''

"I'm against more weapons on campus,'' Garcia acknowledged, including armed police.

"What we need are more eyes and ears, more guidance counselors, more opportunities for our young people to go to,'' he said, saying Arizona has one of the highest ratios of students to guidance counselors in the country.

Closely related to the question of school safety is school choice.

Ducey has proclaimed himself a major supporter, having signed legislation approved by the Republican-controlled Legislature to expand who can get vouchers of tax dollars to send their children to private and parochial schools. The governor also urged voters to ratify that expansion by voting in favor of Proposition 305.

Garcia said he, too, supports "choice'' — but not the way it's defined by incumbent Doug Ducey, which is why he urges a "no'' vote on the measure.

"One of the things that I believe the Legislature has gotten very wrong is they believe is that only parents who have taken their children out of traditional public schools in some way have made a choice,'' Garcia said.

"We have hundreds and thousands of parents who are choosing to be in traditional schools,'' he said. "And I believe that the Legislature needs to honor their choice as well.''

All that goes to the issue of resources.

Ducey said he does believe that more money is needed for K-12 education. But he insisted the state an find that without raising taxes but instead simply enacting "tax reform,'' a concept he declined to explain.

What he did do is take a shot at the now-scrapped Invest in Ed proposal, which had been backed by Garcia, which was designed to generate $690 million a year for education by hiking taxes on income of $250,000 a year or more. Ducey said adoption of that plan "would kill Arizona's economy.''

But Garcia, while having come out in support of higher taxes, was no more forthcoming in terms of exactly how he planned to put more dollars into K-12, saying only that he has a plan that he will share with voters.

Garcia dodged a direct question about whether the state should increase its 18-cent-a-gallon tax on gasoline to fund highway improvements.

"It is a question that has been brought up by people Arizona,'' he said, especially with Arizona having a history of diverting those revenues to balance the state budget.

Ducey said the state's overall economic improvement means there is no longer a need to make those diversions.

Anyway, he said, it makes no sense.

"We're not going to raise gas taxes, especially when electric cars are what's coming next,'' he said.

The moderators, however, had no luck getting either candidate to say exactly what they would do to help secure a steady supply of water for the future. Garcia promised to bring people together to study the issue. Ducey, who has vowed in prior years to come up with a solution, promised a "drought contingency plan'' next legislative session.

The candidates took a side trip down the road of who is tossing mud.

Ducey, in responding to a question about education, told viewers to go to a web site his campaign has constructed which he said exposes the lies that Garcia is telling. That brought a sharp retort from the Democrat.

"Take a look to what it says about the character of the man,'' Garcia said.

"What he is resorting to is, 'The facts matter,''' Ducey responded