voting? reporter: well, fred, president biden has tried to hammer away at his message that he believes republicans would pose a greater risk if they take vol of the house and senate. all of this coming as democrats control could be in jeopardy over economic discontent among voters. the president was here in joliet, illinois campaigning alongside house democrat in a competitive district. and he really zeroed in on on plans to lower prescription drug costs and preserve social security and medicare, programs that the president has argued would be on the chopping block if republicans get control of congress. and the president, as he talked about social security and medicare, had choice words for protesters on the issue of those who say democrats are part of socialism. generations of americans have counted on it, and it works. you didn t have social security, the poverty rate for those over 65 would be four times what it is now. four times. i love those signs when i came in,
caprock canyon state park feels like a journey into a lost age. the sprawling land is home to a herd of southern plains bison, a species that centuries ago dominated the landscape. today is a park where the humans roam. this is my memory wall. reporter: last month rebecca clark had a week of solo hiking. she didn t think it would end up immortalized on this wall. i want to remember that time and all the things that happened. reporter: it s a story she s lucky to tell. this come on. keep going. i just want to get by. okay. reporter: clark recorded on her phone as she crossed paths with bison roaming past a trail. at what point did you realize you were in trail? i think it s when i used
reporter: has this changed the relationship with your animal? i can t believe you did this to me. i m trying to protect the opportunity to go experience nature. this is what makes rebecca clark emotional. she would be devastated if her encounter prevents others from this experience. you love the outdoors that much? yeah. wow. reporter: i am so sorry. it was an aha moment for me there. yeah. i hope i didn t keep somebody else from that. reporter: ed lavandera, cnn, caprock state park, texas. she is lucky to be alive. speaking of luck, do you have your tickets? luck could strike big. a record $1.6 billion.