Republican presidential hopefuls in Iowa are making their final pitch to voters before Tuesday's caucuses kick off the election season. A winter storm has complicated efforts, with freezing temperatures and heavy snow causing candidates to cancel some events and get creative with others. CBS News' Ed O'Keefe has more. "CBS Saturday Morning" co-hosts Jeff Glor, Michelle Miller and Dana Jacobson deliver two hours of original reporting and breaking news, as well as profiles of leading figures in culture and the arts. Watch "CBS Saturday Morning" at 7 a.m. ET on CBS and 8 a.m. ET on the CBS News app. Subscribe to "CBS Mornings" on YouTube: https://www.youtube.com/CBSMornings Watch CBS News live: https://cbsn.ws/1PlLpZ7c​ Download the CBS News app: https://cbsn.ws/1Xb1WC8​ Follow "CBS Mornings" on Instagram: https://bit.ly/3A13OqA Like "CBS Mornings" on Facebook: https://bit.ly/3tpOx00 Follow "CBS Mornings" on Twitter: https://bit.ly/38QQp8B Subscribe to our newsletter: https://cbsn.ws/1RqHw7T​ Try Paramount+ free: https://bit.ly/2OiW1kZ For video licensing inquiries, contact: [email protected]