Hillary Clinton has a challenger for the Democratic presidential nomination. Vermont Senator Bernie Sanders says he's in this race to win.

FOX News Radio's Jared Halpern has more from Capitol Hill:

In the shadow of the U.S. Capitol, Vermont Independent Senator Bernie Sanders lays out why he will run for President as a Democrat.

(Sen. Sanders) "The major issue is how do we create an economy that works for all our people,rather than a small number of billionaires."

Sanders is a lightning rod for the progressive movement, calling for an end to big money in politics and corporate tax reform.

(Sen. Sanders) "I wonder now, in this day and age, whether it is possible for any candidate who is not a billionaire, or who is not beholden to the billionaire class, to be able to run successful campaigns."

Sanders will start well behind front-runner Hillary Clinton in fundraising, name recognition and poll numbers.

On Capitol Hill, Jared Halpern, Fox News Radio.

(AP Photo/Jacquelyn Martin)
(AP Photo/Jacquelyn Martin)

LISTEN to FOX News Radio's special coverage of Sen. Bernie Sanders' press conference: