Here's a link to the full article, about sheepdogging, that was quoted in the Capitol Hill Citizen, with a longer except below:

https://www.blackagendareport.com/bernie-sanders-sheepdog-4-hillary

Sanders: Sheepdogging for Hillary and the Democrats in 2016 – by Bruce Dixon published in May 2015 by Black Agenda Report

1984 and 88 the sheepdog candidate was Jesse Jackson. In 92 it was California governor Jerry Brown. In 2000 and 2004 the designated sheepdog was Al Sharpton, and in 2008 it was Dennis Kucinich. This year it's Vermont senator Bernie Sanders. The function of the sheepdog candidate is to give left activists and voters a reason, however illusory, to believe there's a place of influence for them inside the Democratic party, if and only if the eventual Democratic nominee can win in November.

Despite casting millions of voters for the likes of Jesse Jackson, Al Sharpton and other sheepdogs, those leftish Democrat voters are always disregarded when Democrats actually win. Bill Clinton gave us NAFTA, a vicious “welfare reform,” no peace dividend or push for DC statehood, lowered unemployment but mostly in part time and low-wage jobs, and mass incarceration of black and brown people. President Obama doubled down on bailouts of banksters and GM, and immunized them from prosecution but failed to address the most catastrophic fall in black household wealth in history.

The sheepdog's job is to divert the energy and enthusiasm of activists a year, a year and a half out from a November election away from building an alternative to the Democratic party, and into his doomed effort. When the sheepdog inevitably folds in the late spring or early summer before a November election, there's no time remaining to win ballot access for alternative parties or candidates, no time to raise money or organize any effective challenge to the two capitalist parties.

At that point, with all the alternatives foreclosed, the narrative shifts to the familiar “lesser of two evils.” Every sheepdog candidate surrenders the shreds of his credibility to the Democratic nominee in time for the November election.