It's all but official: Sen. Rand Paul, R-Ky., will todayannounce he's running for president.
On the 2016 campaign trail, Paul, an ophthalmologist and son of the libertarian-leaning former GOP presidential candidate Ron Paul, is hoping to tap into the grassroots energy that helped catapult him onto the national stage in the first place.
Cash is a key to Paul's success in what's certain to be a crowded Republican primary field. Here's more about the financial history of this outsider-turned-insider who wants his next home to be the White House.
Sources: Center for Public Integrity reporting, as well as The American Conservative, Center for Responsive Politics, Citizens for Responsibility and Ethics in Washington, Federal Election Commission, NNDB.com, Pageonekentucky.com and YouTube.
Image sources: Cheryl Senter/AP, Jose Luis Magana/AP, stumpsource.org/Flickr and Gage Skidmore/Flickr.