[QuinqueViae]

What is the source for the list?

The reference link is posted at the original story at theconservativetreehouse.com. Here it is for you.

http://www.opensecrets.org/politicians/contrib.php?cycle=Career&type=I&cid=N00033085&newMem=N&recs=20

[Smokin' Joe]

From the fine print at the bottom of the page at that link:

This table lists the top donors to this candidate in 2011-2016. The organizations themselves did not donate, rather the money came from the organizations' PACs, their individual members or employees or owners, and those individuals' immediate families. Organization totals include subsidiaries and affiliates.

NOTE: All the numbers on this page are for 2011-2016and based on Federal Election Commission data available electronically on echo Monday, August 03, 2015.

So that is five year's worth of donations, and would include PAC contributions to his Senate run.

[2ndDivisionVet]

Joe: Look at his sign-up date.