"Joe Biden is betting a blue-collar campaign can win over a Democratic Party that's grown more green than ever.
The former vice president is expected to launch his White House bid this week backed by the major firefighters union. Last week, he hit the picket line with striking grocery workers in New England. And on Monday, a Pittsburgh union hall will host his first campaign event.
That reliance on unions could preview how Biden balances a few of the 2020 race's major dynamics.
Many Democratic base voters — especially the young, liberal activists coolest toward Biden — want aggressive emissions reductions. Meanwhile, some unions — especially the building trades close to Biden — fear winding down fossil fuel projects could mean fewer jobs and lower pay."
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