Note to Biden - get in

Hey Joe, run.

Joe Biden hasn't yet announced his plans for a 2016 White House bid, but a new poll shows that he would enter the race as the most popular presidential candidate if he chose to toss his hat into the ring.

According to a new NBC News/Wall Street Journal poll, 40 percent of Americans have a positive impression of Biden, while 28 percent have a negative impression (+12).

That's compared to fellow Democrats Bernie Sanders (+10) and Hillary Clinton (-8), and to top-tier GOP candidates Ben Carson (+8), Carly Fiorina (+7) and Donald Trump (-33).

 I'm starting to think though, it's not in Biden's line of sight.