don't believe joe heck's attacks. catherine cortez masto has always served with integrity. as a federal prosecutor and attorney general... she made sex trafficking a felony crime. she worked with the bush and obama administrations uce crime. that's why she's endorsed by law enforcement across nevada. catherine cortez masto. catherine cortez masto. i trust her to keep us safe. i'm catherine cortez masto, and i approve this message.

jim dunlap: too many nevada police officers have been killed in the last few years. the truth is, we make it too easy for criminals and the dangerously mentally ill to buy guns. they get them at gun shows or online from strangers, no questions asked. so here's something we can do to honor the fallen: in states that have closed the loophole, nearly half as many police officers have been shot and killed in the line of duty. background checks save lives. v.o.: yes on question one.

and congressman heck called it "a blip." narrator: in 2008, joe heck called nevada's housing crisis "a blip on the radar." that's just how out of touch joe heck is. narrator: after heck sponsored a bill giving tax breaks to big banks, he took over $500,000 from wall street-- including banks who caused the housing crisis. it's clear what joe heck's priorities are, and families like mine get left behind. narrator: afscme people is responsible

leaving us holding the bag. i'm hillary clinton and i approve this message.

john mccain, a war hero. he's not a war hero, he's a war hero because he was captured. i like people that weren't captured ok. donald trump compared his sacrifices to the sacrifices of two parents who lost their son in war. how would you answer that father? what sacrifice have you made for your country? i think i've made a lot of sacrifices, built great structures. i've had tremendous success, i think...

nursery. but, first, this is "today" on

back in a moment. don't believe... don't believe... don't believe joe heck's attacks. catherine cortez masto has always served

s created in clean energy. that's how many nevada jobs joe heck puts at risk... when he votes big oil's way. joe heck's taken hundreds of thousands in big oil money... and voted their way... protecting billions in tax breaks for oil companies. and threatening nevada's solar economy. twenty five thousand nevada jobs at risk. because joe heck's in big oil's pocket. lcv victory fund is responsible for the content... of this advertising. he worst days of our lives, and congressman heck called it "a blip."

that's how many jobs nevada's created in clean energy. thatat's how many nevada jobs je heck puts at risk... when he votes big oil's way. joe heck's taken hundreds of thousands in big oil money... and voted their way... twenty five thousand nevada jobs at risk. because joe heck's in big oil's pocket. lcv victory fund is responsible for the content... of this advertising.

and i approve this message. iting, xenophobic, religious bigot. donald trump is a phony, a fraud. he's not a serious adult. i can't vote for donald trump given the things that he said. trump should not be supported. i believe he's disqualified himself to be president.

nbc. i'm hillary clinton and i approve this message. i know more about isis then the generals do. john mccain, a war hero. he's not a war hero, he's a war hero because he was captured.