Potential 2028 presidential contenders from both major parties have formed exploratory committees or signaled interest through public appearances and fundraising, yet as of August 2026 no leading figures have formally announced campaigns. Traders assign modest probabilities across names such as Kamala Harris, Rahm Emanuel, Gavin Newsom, and Mark Kelly, reflecting uncertainty over announcement timing before the December 31, 2026 resolution date. Democrats recently advanced discussions on the 2028 primary calendar, while Republican positioning centers on figures tied to the current administration. Historical patterns show early announcements often follow midterm results or party conventions, with FEC filings by lesser-known candidates already occurring but major contenders typically waiting for clearer signals.