The Keystone XL Pipeline has emerged as a major issue in the Massachusetts special U.S. Senate election, with environmental groups committing nearly one-third of the $1.25 million in outside money already spent on campaigns.

The biggest spender so far is the League of Conservation Voters, which has already spent more than $545,000 to help elect Democratic candidate and Rep. Ed Markey, who has a strong pro-environment platform.

“Our field campaign is resonating with voters across Massachusetts,” said Navin Nayak, a political specialist for the group. “The people of Massachusetts want climate change champion Ed Markey representing them.”

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