Polling at 0.4% nationally, Rick Santorum suspends his Presidential campaign and falls all over Rubio in the process

Source:  Real Clear Politics

*Rand Paul and Mike Huckabee have also suspended their campaigns since the Iowa caucuses.

As quoted in Rick Santorum Endorses Marco Rubio After Dropping Out of Presidential Race. (The Wrap, 2/3/2016)

Spare the rod and spoil the child.
Santorum Launches 2020 Campaign, by Andy Borowitz.  (The New Yorker, 2/3/2016)