New Delhi, Feb. 28 -- An emphatic election victory for Britain's environmentalist Green Party is a nightmare for Prime Minister Keir Starmer that raises questions about how long he will continue as leader.

Less than two years after winning power in a landslide, Starmer's center-left Labour Party not only lost a longtime stronghold in its northern England heartlands - it came third, finishing behind both the left-leaning Greens and the hard-right party Reform U.K.

Thursday's election in the Gorton and Denton constituency of Greater Manchester was for just one seat out of 650 in the House of Commons. But it's a glimpse into the messy new reality of British politics, and its consequences could be far-reaching.

Here are takeaways from the ...