By Blake Neff Just a couple months ago, Bernie Sanders lambasted Uber as an "unregulated" company with "serious problems," but financial disclosures by the Democratic presidential candidate reveal that whenever his campaign requires a taxi, they literally always turn to Uber.

According to research done by National Journal, 100 percent of Sanders' spending on taxi and ride-sharing services was spent on Uber. Among 2016 presidential contenders, that's a distinction Sanders shares with only Bobby Jindal, Martin O'Malley, and the defunct Scott Walker and Rick Perry campaigns. (RELATED: Bernie Sanders Does NOT Like Uber)

It also puts him way ahead of Hillary Clinton, who only had 41 percent of her taxi costs go to Uber. Only Clinton and Mike Huckabee spent more than half of their taxi spending on traditional taxis rather than modern ride-sharing apps.

Lindsey Graham was the least Uber-happy candidate, with only 25 percent of his taxi expenses going to the company. Graham was also the only candidate to use Uber's rival Lyft, with the company absorbing some 31 percent of his taxi spending.