Trying to get a reaction.
Check it out:

Massachusetts U.S. Sen. Elizabeth Warren caused a few heart palpitations with an email sent through the Democratic Senatorial Campaign Committee on Saturday with the simple and direct subject line: “I’m in.”

The liberal Democrat is “in,” but not in the way many progressives hoped.

Instead of announcing that she will run for president in 2016 against likely candidate Hillary Clinton, Warren was merely announcing that she’s “in” on the fight to reclaim the U.S. Senate.