Several prospective 2016 major party presidential candidates will be making their plans known in the weeks ahead. Here's a summary of those, as well as a list of those that have declared and those that have formed exploratory committees (or similar) but have not made any further announcements regarding their 2016 candidacy.
May 27: Former Pennsylvania Senator Rick Santorum (R) is likely to run
May 28: Former New York Governor George Pataki (R) may or may not run
May 30: Former Maryland Governor Martin O'Malley (D) is expected to run
June 1: South Carolina Senator Lindsey Graham (R) is expected to run
June 4: Former Texas Governor Rick Perry (R) is expected to run
Democrat: Hillary Clinton, Bernie Sanders
Republican: Ben Carson, Ted Cruz, Carly Fiorina, Mike Huckabee, Rand Paul, Marco Rubio
Democrat: Lincoln Chafee, Jim Webb
Republican: Jeb Bush, Chris Christie, Bobby Jindal, John Kasich, Donald Trump, Scott Walker
Update May 18: Bobby Jindal announces the launch of his exploratory committee
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