It's Kirkpatrick's third term in Congress.
Tobin called Kirkpatrick to concede Wednesday morning.
The results so far reflect 45 percent of precincts and early ballots.
Kirkpatrick says more people have coverage under Obamacare; Tobin says fewer.
Most advertising money is being spent elsewhere in CD1.
Donate $1,000 to Martha and Andy, and have breakfast with Mitt.
A liberal group that has been supporting Democrat Ruben Gallego in his run for Congress in Arizona's District 7 is now turning its attention to attacking Republican Andy Tobin in Arizona's District 1.
Kirkpatrick, Tobin support balanced-budget amendment, won't commit to never raising taxes.
Congressional candidates also touch on economy and health care.
Attack ad shows desperation, says the congressional challenger.
"Short skirt and high heels? Nope, not me," Kirkpatrick says.
Tobin defends deep cuts as part of a balanced budget package
Andy Tobin won 36 percent of the votes; Kiehne took 35.
Tobin won with 36 percent of the vote.
In a race that's considered a tossup, the Democratic Congressional Campaign Committee posted a new web video attacking Republican Andy Tobin.
Lots of early and provisional ballots remain to be counted in sprawling district.
Tobin campaign believes they can win, and avoid a recount.
It could be days before a winner is known in the sprawling district.
One in five voters polled said they're undecided in CD1 Republican primary.
Congressional District 1 candidate Andy Tobin is getting more support from one of the biggest names in Republican politics — Mitt Romney.