Enviro group ups spending to unseat Mass. Sen. Brown

The mailer, along with a more than $700,000 canvassing initiative, will likely push the group’s spending on the race over the $1 million mark, Nayak said.

LCV’s political action arm has spent more than $5 million so far in this election cycle, already topping its 2010 total, Nayak said.

It has backed Democrats Warren, Rep. Martin HeinrichMartin HeinrichWeek ahead: Republicans dig into FCC agenda Dem senators blast ‘sprawling’ expansion of spy power Overnight Cybersecurity: Questions linger after Clinton email probe MORE (N.M.), former Virginia Gov. Tim KaineTim KaineDem sales job on Hillary Clinton moves into high gear FULL SPEECH: Cecile Richards, Planned Parenthood Top Clinton official says she would likely scrap trade deals, start anew MORE, Rep. Chris MurphyChris MurphyWeek ahead in health: All eyes turn to Dem convention Overnight Healthcare: Mysterious new Zika case | Mental health bill in doubt | Teletraining to fight opioids Hopes dim for mental health deal MORE (Conn.) and Sen. Jon TesterJon TesterSenate Dems push Obama for more Iran transparency Bayh jumps into Indiana Senate race Six senators call on housing regulator to let Congress finish housing finance reform MORE (Mont.).

Last week, LCV opened up a six-figure campaign against Murphy’s Republican opponent, Linda McMahon. The group also spent $850,000 on a direct-mail effort in Virginia that aims to paint Kaine’s rival, former Sen. George Allen (R-Va.), as a pawn of Big Oil.

The group also has spent $1.5 million on House races attempting to unseat five GOP lawmakers it has dubbed the “Flat Earth Five.” That campaign targets Reps. Ann Marie Buerkle (N.Y.), Dan BenishekDan BenishekTea Party class reassesses record Michigan Republican to retire The Republicans who voted to withdraw from ISIS war MORE (Mich.), Dan Lungren (Calif.), Quico Canseco (Texas) and Joe Walsh (Ill.).

Nayak said such endeavors would continue through the Nov. 6 election.

“Absolutely,” he said. “We continue to see really stark contrasts between the candidates on our issues in these elections.”

Nayak said he hopes the 150,000 people reached through the mailer will make it “very hard for them to even consider voting for Scott Brown.”

The mailer will emphasize Brown’s vote to sustain oil industry tax breaks, which Nayak said is out of step with most Massachusetts voters.

Nayak noted that a higher turnout is expected in a presidential election year compared with the special election Brown won to replace the late Sen. Ted Kennedy (D-Mass.). He said the mail campaign is necessary to familiarize more of the state’s voters with Brown’s positions and record.

The Hill rates the Massachusetts race as a “toss-up.”