Contenders hide ambitions behind their grammar

For those trying to predict who will run for US president in 2016, scrutinizing grammar has become something of a fixation.

Nobody has formally announced a White House bid, but plenty of the country's top politicians are obviously jockeying for position - all the while performing semantic gymnastics when directly asked The Question: Will you run for president?

Fortune magazine made a splash on Tuesday when it published an interview with Democratic Sen. Elizabeth Warren, a liberal favorite who has said repeatedly she is "not running for president."