And the difference, for Scott Walker, was a rapidly shrinking donor base

As quoted in Scott Walker Mounts a Last Stand in Iowa. (Bloomberg Politics, 9/21/2015)

Guess he blew through that money in a hurry.

In the interview, Walker said his campaign is paying its bills and not deficit spending.

And now today.
Scott Walker press conference at Edgewater Hotel: Please join me, Mike Huckabee, Rand Paul, John Kasich, Chris Christie, Rick Santorum, Bobby Jindal, Lindsey Graham, George Pataki, and Jim Gilmore.  (9/21/2015)