The League of Conservation Voters announced on Monday a new, six-figure field campaign to boost Rep. Edward J. Markey’s bid for the Democratic nod in the Massachusetts special election for Senate.

Meanwhile, a source tells CQ Roll Call that Markey will begin a television ad campaign on Tuesday, ramping up his election effort seven weeks before primary voters decide between him and Rep. Stephen F. Lynch.

LCV, a well-funded environmental group, said the organization would spend at least $650,000 on the field campaign by the April 30 primary.

The size of Markey’s TV buy was not immediately available.

Markey led Lynch by significant margins in a series of recent polls. Markey has the backing of the LCV, along with the Democratic Senatorial Campaign Committee, among others.

“This field campaign will make sure primary voters know that Ed Markey is the only candidate in this race that has written some of the most historic environmental legislation ever considered by Congress,” Navin Nayak, the LCV senior vice president of Campaigns, said in a statement.

Here’s an example of the literature the LCV will use.

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