You can open his bio on the site where it shows his picture and "OCCUPATION: Senator, 2011 - Present"
The ACLU Pat Toomey is Patrick C. Toomey. Picture of him here: https://www.justsecurity.org/author/toomeypatrick/
The Senator is Patrick Joseph Toomey Jr.
Maybe the Hill automates scanning the bylines and adds links to bios. Obviously it isn't perfect.