Marco Rubio’s top campaign adviser couldn’t contain his glee at the prospect of discussing the presidential candidate’s Spartan spending habits on the day that Scott Walker dropped out of the Republican primary in part because of profligate spending.

“We’ve run such a lean campaign at times, taken knocks for it. But keeping control of the budget is such an important thing,” said Terry Sullivan, campaign manager for Rubio, the U.S. Senator from Florida.

At an event hosted by Google and National Review, at Google’s Washington headquarters near Union Station, Sullivan boasted how every staffer has taken a pay cut to work for Rubio, how they sell bumper stickers and yard signs rather than giving them away, how Rubio flies commercial 95 percent of the time he travels (the other five percent is on a private jet), and how he, Sullivan, personally monitors every significant purchase.