Perhaps the key lesson that we can learn from the results of the 2008 battle between Clinton and Obama is that Sanders supporters probably do not have to love Clinton in order to vote for her in the general election. They merely have to like her as well or better than Trump, and that should be a very easy bar to clear.

Trump has far less appeal to Democratic voters in 2016 than McCain had in 2008. According to the 2008 ANES data, McCain was viewed favorably by 23% of all Democratic identifiers and leaners and unfavorably by 58%. In contrast, according to four recent national polls — CNN, Fox News, CBS News/New York Times, and Public Policy Polling — Donald Trump is viewed favorably by only 5% to 12% of Democratic voters and unfavorably by 82% to 89%. And while these polls did not provide data on Trump favorability among Clinton and Sanders supporters, it seems unlikely that he is viewed more favorably by Sanders voters, who tend to be, if anything, further to the left and more suspicious of billionaires than Clinton supporters…

A somewhat greater concern for Democrats in 2016 may be ensuring that Sanders’ youthful supporters actually make it to the polls. A much larger share of Sanders backers than 2008 Clinton backers are under the age of 30, which means they are probably less reliable general election voters. The Clinton campaign clearly will need a strong get-out-the-vote effort and all the help they can get from Sanders in motivating his young supporters to turn out in November. But someone else should also be able to help a great deal with the task of unifying Democrats and increasing turnout among Sanders supporters: President Obama. Fortunately for Clinton, Obama is extremely popular with Democratic voters, including Sanders supporters. In the latest NBC News/Wall Street Journal national poll, Obama’s approval rating among Democrats was 88% and his approval rating among Sanders primary voters was 82%.