With no clear front-runner and new campaign rules that could leave the field open well after the first votes are cast, analysts see room for many twists still to come.

Barely three months before the first votes are cast, the Republican race for president is up for grabs, complicated by the absence of a clear front-runner and the rules that have guided the GOP’s selection process for the past several decades.

The rise of the “tea party” movement, with its contempt for convention, has undermined the tradition of bestowing the nomination on the candidate presumed next in line, who usually paid their dues through long service or a previous White House try.