The US Constitution is available in print and digital versions. Most of these texts are located in the KF 4527 section on Level 3 of Coe Library.

A recommended text is The Annotated U.S. Constitution and Declaration of Independence, edited by Jack N. Rakove.  http://uwcatalog.uwyo.edu/record=b3191327~S1  An ebook version of this text is available at this link: http://uwcatalog.uwyo.edu/record=b5607619~S1

A simple Google search will turn up many digital versions of the US Constitution. We recommend using an official government source such as the Government Printing Office (GPO). 

The GPO has an online version dated 2017 at this link: https://www.gpo.gov/fdsys/pkg/GPO-CONAN-2017/pdf/GPO-CONAN-2017-6.pdf

The Amendments to the US Constitution are available from the GPO website: https://www.gpo.gov/fdsys/pkg/GPO-CONAN-2017/pdf/GPO-CONAN-2017-7.pdf

Additional documents related to the US Constitution, including analysis, are available at this link.