Politico says:

Saying that “it’s important we start early,” Sen. Claire McCaskill on Tuesday endorsed Hillary Clinton for president in one of the first major moves of the 2016 cycle....McCaskill backed President Barack Obama over Clinton in the 2008 cycle, something she acknowledged in the statement.

Holy shit. Clinton doesn't even have a campaign yet, and she's already getting endorsements. Like it or not, you're going to start seeing 2016 stories popping up everywhere very soon. Speaking of which, Politico also ran a story this morning theorizing that Bill Clinton is trying to reposition himself as a speaker on issues "that historically have been a natural province of first ladies." If Bill Clinton intentionally takes himself out of politics, that's probably the best sign yet that Hillary Clinton is going to run for office.

* The answer to the question in the headline is obviously no. According to just about every evangelical Christian in the country, Jesus Christ has already agreed to endorse whichever Republican winds up being the 2016 presidential candidate, because that's always how that works.