Bartaa's market spreads across a narrow valley that is dissected by crossroads.
The gun show is one of five that is held in Tucson each year by Crossroads of the West, a Utah company.
A recent commercial by Crossroads GPS, criticizing Representative Joe Sestak, who is running for the Senate in Pennsylvania, ends by urging viewers, "Tell Congressman Sestak, 'Stop the Medicare cuts,' " and displays his phone number.
The ad campaign by Crossroads GPS fills a Republican void on the airwaves in several battleground states, like Florida, North Carolina, Ohio and Virginia, which have so far been dominated by ads from the president and his supporters.
In a statement to reporters, Mr. Burton says of the ad by Crossroads, the group founded by the Republican strategist Karl Rove : "If Romney wins, the fictional woman in Rove's ad would see the 'gradual demise' of her fictional Medicare.
But he is well known to watchdog groups tracking the explosive growth of outside spending this year — and is feared by the Democratic candidates who have been pummeled by Crossroads ads.
At the news briefing, he showed a broadcast spot attacking Elizabeth Warren, a Democratic candidate for Senate in Massachusetts, that was sponsored by Crossroads GPS, a super PAC started with help from the strategist Karl Rove, President George W. Bush's top political adviser.
An ad by Crossroads GPS that highlights the struggles of a woman whose grown children are forced to move in with her because of the worsening economy during Mr. Obama's tenure.
As Jeremy Peters recently reported in The Times, that ad is part of a $25 million campaign that was based on 18 focus groups and field tests conducted by Crossroads, all to determine the most effective attack lines against the president.
The commercial, which was produced by Crossroads GPS, the group run with the help of Karl Rove and other top Republican strategists, features Ted and Pat Oparowski, a couple who lost their young son to cancer 30 years ago.
The Solaris, a $250 million redevelopment project by Crossroads Redevelopment, will replace a 1970s-era structure with a new building containing 75 condos, 60,000 square feet of retail and restaurant space, a movie theater and underground parking.
