>> andrea benson. >> reporter: how do you know it's andrea benson? car, registered to her. >> reporter: you can read license plates with those cameras? >> they're pretty good. >> reporter: detectives obtained data dumps from cell phone towers in washington, d.c., that allowed them to map the travel of the cell phones as they pinged off the towers. can you follow diana's cell phone? >> it bounced all around washington, d.c., simultaneously with andrea's. they were together the entire day. >> reporter: by late friday, the night peggy was murdered, diana's phone stopped moving and went quiet. but andrea's phone? >> we saw andrea's phone head out of the washington area and head up i-95. >> reporter: exactly the way you would drive if you were heading for peggy's house? >> right. >> reporter: along the way, the tracfone was activated. and at 1:17 a.m., it pinged a cell tower right near peggy's house. what was going on? was this murder for hire? did andrea benson drive up to new york, call peggy on the tracfone, somehow get into her house and murder her? a

i am andrea tantaros and here with us back from vacation harris faulkner sandra smith, jedediah bila and today's #onelucky guy, political editor of townhall.com guy benson is back. he is outnumbered. welcome back guy. >> it is great to be back. >> last time you were here your book was out and it has done well. congrats on that. >> thank you. >> starting a lot of conversations. >> that is the whole goal. >> speaking of starting one let's start ours. this a big week for republicans three days before the presidential debate which you will see here on fox news donald trump is remaining the momentum in the poll as the 17 gop candidates viafight for a spot. donald bush and walker are in the top three but a recent surge by kasich is putting him in a three-way tie with governor's chris christie and rick perry. why is that significant? only the top 10 in the national polls complete on the thursday 9 p.m. stage. those not making the cut appear in the undercard debate earlier in the day. christie and perry if they expect to be on the main stage. >> i will be there thursday night. >> you will make the top ten? does it matter? >> i think it is an important first ste

i am andrea tantaros and here with us back from vacation harris faulkner sandra smith, jedediah bila and today's #onelucky guy, political editor of townhall.com guy benson is back. he is outnumbered. welcome back guy. >> it is great to be back. >> last time you were here your book was out and it has done well. congrats on that. >> thank you. >> starting a lot of conversations. >> that is the whole goal. >> speaking of starting one let's start ours. this a big week for republicans three days before the presidential debate which you will see here on fox news donald trump is remaining the momentum