Currently, the most interesting is Ted Cruz. His strategy of ignoring his party and going straight to the people is receiving plenty of brandname media attention. Here is coverage from The Wall Street Journal.
No seasoned politico agrees that beleagured Chris Christie is toast. The guy is too shrewd and too resilient. And middle-of-the-road Jeb Bush could surprise us. He has access to funding for the most brilliant political advisors and communicators.
Meanwhile, Chelsea Clinton's pregnancy was a media event. However, that high profile publicity could cause a backlash about the family dynasty. Democratic heavies could wind up feeling played with by the Clintons. In a wonderfully passive-aggressive way they could undermine Hillary and slip in someone they can make outsized.